You Know Why Characters

A former travel-food photographer turned suburban wife, mother, and food writer, married to Andrew 'Trey' Locke. After Trey vanishes at an Atlanta airport, she is hit by an SUV, suffers a severe concussion with memory loss, and discovers her husband's hidden earlier life. She spends most of the story fighting to protect her children, recover her memories, and determine who is threatening her family.

Arc: Begins as a trusting, domesticated wife whose life is upended by Trey's disappearance and her own near-fatal attack. She gradually recovers fragmented memories, learns the truth about Trey's undercover role and Eden's menace, and ultimately leaves Nashville with Trey to start over in Venice, where she realizes she may be pregnant.

• Andrew 'Trey' Locke — her husband of ten years and father of her children
• Margot Thomas — her devoted twin sister
• Four (Andrew Edward Locke IV) — her son
• Neve — her daughter
• Eden Barrow — a stranger who becomes her enemy and tries to frame her
• Alex Durov — her former lover, whom she thought was dead
• Theresa Lee — the detective who questions her and later protects her
• Robert 'Bob' Gussin — her uncle-by-adoption and Trey's boss
• Patricia 'Pat' Gussin — her aunt figure
• Roman Thomas — her estranged father
• Roger Bandolier — her former boss, connected to a death in her past
• Bohdi — the family cocker spaniel

Chloe Barrow's older sister, introduced as a grieving woman vowing justice after Chloe's murder. She recognizes Andrew Locke as Trey on a plane and inserts herself into Brooklyn's life, watching the children and posing as a helper. In reality she is obsessed, manipulative, has a history of poisoning Chloe with nicotine, and ultimately stages a mass poisoning to frame Brooklyn.

Arc: Begins as Chloe's apparent avenger but is slowly exposed as a dangerous, possessive figure who tries to take over Brooklyn's home and family. After poisoning Margot and the children, she drinks her own poison as cover, ends up in a coma on life support, and is remembered plotting with Alex Durov while her brain activity continues.

• Chloe Barrow Locke — her younger sister, who she poisoned years before and whose death haunts her
• Andrew 'Trey' Locke — her sister's husband, whom she blames and hunts
• Brooklyn Locke — the woman whose life and family she tries to take over
• Margot Thomas — Brooklyn's sister, whom she befriends and manipulates
• Four (Andrew Edward Locke IV) — one of the children she cares for and later poisons
• Neve — one of the children she cares for and later poisons
• Alex Durov — her co-conspirator in the revenge plot
• Theresa Lee — the detective she called to the case

Brooklyn's former boyfriend, whom she believed was killed by Roger Bandolier years ago. He reappears as the blond, curly-haired man following Trey from the airport and is linked to Russian criminal networks, an Interpol Red Notice, and the Gussins' operation. He allies with Eden, abducts Brooklyn in the storm shelter, and demands the crypto wallet.

Arc: Rises from a ghost of Brooklyn's past to the physical threat chasing Trey and his family. He shoots Brooklyn during the shelter confrontation and is killed by Drake's shot in the dark.

• Brooklyn Locke — her former lover and later hostage
• Andrew 'Trey' Locke — the man he is hired to hunt
• Eden Barrow — his co-conspirator
• Roger Bandolier — the man who supposedly killed him years earlier
• Drake Sheehan — the agent who kills him
• Chloe Barrow Locke — the woman Andrew says he killed

Brooklyn's uncle through adoption, Trey's boss at Gussin Group, and trustee of family trusts. He initially presents himself as a betrayed mentor who turned Trey in after discovering stolen money. The FBI investigation reveals the Gussin Group's money-laundering and trafficking operation, and he ends the story in federal custody.

Arc: Goes from being a trusted family elder to an accuser of Trey, then is exposed as part of the criminal operation behind the theft and threats. He is arrested as Operation Angelmaker takes down the Gussins.

• Brooklyn Locke — his niece by adoption
• Patricia 'Pat' Gussin — his wife
• Andrew 'Trey' Locke — his employee, whom he framed and turned over to authorities
• Roman Thomas — his adopted brother
• Margot Thomas — his niece by adoption

Bob Gussin's wife, called Aunt Pat by Brooklyn and treated as a grandmother figure to Four and Neve. She visits Brooklyn in the hospital to press her about Trey's location and later claims she loves Brooklyn and Margot like her own. In the final law-enforcement sweep, she and Bob are taken into custody with the Gussin organization.

Arc: Presents herself as a wounded mother figure while siding with her husband against Brooklyn. She is part of the Gussin circle that is arrested after Trey is revealed as an FBI asset.

• Robert 'Bob' Gussin — her husband and partner
• Brooklyn Locke — her niece figure
• Margot Thomas — her niece figure
• Andrew 'Trey' Locke — someone she and Bob describe as having broken their hearts

Brooklyn's husband, the father of Four and Neve, and the man formerly known as Andrew Locke from Malogen, Georgia. He was accused of murdering his first wife, Chloe, but is later revealed to be a long-term FBI undercover asset in John Baldwin's Operation Angelmaker. He abandons his family at the airport after being recognized and spends much of the story hunted while trying to protect them.

Arc: Moves from seeming husband with a spontaneous Italy plan to a fugitive suspected of murder and embezzlement. He is revealed as an undercover operative whose marriage to Brooklyn is real, helps rescue her in the storm shelter, and relocates the family to Venice after the Gussins are arrested.

• Brooklyn Locke — his wife, whom he loves and protects
• Four (Andrew Edward Locke IV) — his son
• Neve — his daughter
• Chloe Barrow Locke — first wife, whose murder he was blamed for
• Eden Barrow — Chloe's sister and his accuser
• Alex Durov — the man who pursued him and, per his account, killed Chloe
• Robert 'Bob' Gussin — his boss and the man who framed him
• John Baldwin — his FBI handler
• Colonel Andy Locke — his father
• Lucy Locke — his mother

Eden's younger sister and Andrew Locke's first wife, murdered on Christmas Eve eleven years before the main story while wrapping presents; scissors were involved and a pregnancy test was nearby. Flashbacks show her as a young woman in love with Andrew, secretly married to him, and made ill by Eden's nicotine poisoning before her death. Her unsolved murder is the emotional engine behind Eden, Theresa, and the plot.

Arc: Has no living arc; her history is reconstructed through flashbacks, police files, and other characters' memories. The truth of her death is reframed when Andrew's undercover role is revealed and Aleksey Durov is identified by Andrew as the man who killed her.

• Eden Barrow — her older sister, who poisoned her and is tied to her death
• Andrew 'Trey' Locke — her husband, who was accused of killing her
• Alex Durov — identified by Andrew as the man who killed her

Brooklyn's twin sister, a fiercely protective presence who rushes to Atlanta, stays at Brooklyn's hospital bedside, and helps manage the children. She initially befriends and defends Eden, even relying on her during Brooklyn's recovery. After a neighbor recognizes Eden from before the accident, Margot turns against Eden and helps force her out.

Arc: Moves from being Brooklyn's caretaker to an active protector who questions Eden and sides with her sister. In Venice she stays with Brookie, Trey, and the children for three months, and her final farewell reveals the shared guilt and protective secret between the sisters.

• Brooklyn Locke — her twin sister
• Eden Barrow — a woman she befriends, defends, and later suspects and rejects
• Four (Andrew Edward Locke IV) — her nephew
• Neve — her niece
• Robert 'Bob' Gussin — the family's uncle through adoption
• Patricia 'Pat' Gussin — her aunt figure
• Roman Thomas — her estranged father

The Malogen detective who originally investigated Chloe Locke's murder and never closed the case. Eden calls her after spotting Andrew on the plane, and Theresa identifies him from a photo as Trey Locke. She works with FBI agent Drake Sheehan, survives an attack in her kitchen, investigates the deaths of Andrew's parents, and is eventually shot while protecting Brooklyn.

Arc: Begins haunted by Chloe's unsolved murder and her own lost relationship with Drake. She pursues Andrew as a suspect, discovers he is an FBI asset, helps bring down the actual threat, and ends the story recovering with Drake and deciding with Trey whether Eden should remain on life support.

• Eden Barrow — an old contact who draws her into the reopened case
• Chloe Barrow Locke — the murder victim whose case she could never close
• Andrew 'Trey' Locke — the former suspect she later learns is an undercover asset
• Brooklyn Locke — the injured wife she questions and later protects
• Drake Sheehan — her FBI partner and lover
• Alex Durov — the man she eventually identifies as responsible for Chloe's death

An FBI agent also called Agent Sheehan, who becomes Theresa Lee's partner and later her lover. He helps analyze surveillance footage, coordinates the hunt for Andrew and Alex Durov, and insists on full honesty between him and Theresa. He kills Alex Durov in the dark storm shelter to save Brooklyn.

Arc: Moves from a Quantico-based contact to a hands-on investigator in Nashville, building the case with Theresa. He survives the shelter shooting, cares for Theresa afterward, and remains her partner as the Gussins are arrested.

• Theresa Lee — his fellow agent and love interest
• Andrew 'Trey' Locke — the suspect and later asset he investigates
• Brooklyn Locke — a witness and victim he helps protect
• Alex Durov — the man he kills in the shelter
• John Baldwin — the FBI official who gives them a secure workspace

The young son of Brooklyn and Trey, called Four. He is cheerful, observant, and loves his father; after Trey disappears, he tries to stay brave for his sister. Following Trey's instructions, he leads Brooklyn to the hidden shelter where crypto wallets and a cloned burner phone are concealed.

Arc: Experiences the upheaval of his father's disappearance and his mother's hospitalization before being poisoned by Eden. He survives, and in Venice the children's nightmares slowly begin to ease.

• Brooklyn Locke — his mother
• Andrew 'Trey' Locke — his father
• Neve — his sister
• Margot Thomas — calls her Aunt Margot
• Eden Barrow — an adult who cares for him but later poisons him

The young daughter of Brooklyn and Trey, a dancer obsessed with The Nutcracker. She adores Eden while Eden is posing as a caregiver and asks if Aunt Eden can stay with them. She is poisoned alongside her brother but survives.

Arc: Goes from a happy child rehearsing ballet to a traumatized girl whose family is torn apart. After the family relocates to Venice, her nightmares ease as she regains some normalcy.

• Brooklyn Locke — her mother
• Andrew 'Trey' Locke — her father
• Four (Andrew Edward Locke IV) — her brother
• Eden Barrow — the woman she calls Aunt Eden and who later poisons her
• Margot Thomas — her aunt

A senior FBI official and the controller of Andrew Locke's undercover assignment in Operation Angelmaker. He makes Theresa Lee and Drake Sheehan sign NDAs, reveals Andrew's true role, and oversees the takedown of the Gussin operation. He helps get Brooklyn cleared and provides the couple with an FBI safe house before they leave Nashville.

Arc: Stays in the background until he steps forward to protect his classified operation and asset. He assists in the takedown and then helps extricate Brooklyn and Trey from the aftermath.

• Andrew 'Trey' Locke — calls him his asset and undercover operative
• Theresa Lee — the visiting agent he puts in a secure workspace
• Drake Sheehan — an FBI colleague he recognizes
• Brooklyn Locke — the wife of his asset, whom he helps protect

The estranged father of Brooklyn and Margot, and Bob Gussin's adopted brother. A background check reveals federal drug-related convictions and prison time, and Patricia Gussin later describes him as a former drug runner. He is evasive when Theresa calls him about Brooklyn's past in France.

Arc: Does not appear directly in the present, but his criminal history and refusal to discuss Brooklyn's past become an important investigative thread. He remains off-screen as the agents weigh questioning him.

• Brooklyn Locke — his estranged daughter
• Margot Thomas — his estranged daughter
• Robert 'Bob' Gussin — his adopted brother

Brooklyn's former boss, a chef whose show she photographed before his fatal overdose of cocaine laced with fentanyl. In Brooklyn's account, he argued with Alex Durov, shot him, pushed his body into a river, and later died the same night. He appears as a haunting memory and his death is tied to the unresolved events in France.

Arc: Is dead before the story begins but remains part of Brooklyn's past. His relationship with Alex and his death in France become central to the investigators' attempt to connect Brooklyn to Durov.

• Brooklyn Locke — her former boss and the source of a dark secret in France
• Alex Durov — the man he allegedly shot and pushed into a river

Andrew's father, a retired Air Force colonel who lives in Malogen with his wife, Lucy. He and Lucy cut off contact with Andrew after Chloe's murder and stopped hosting their annual holiday open house. In the present he is found hanged in the garage, with evidence suggesting he was alive while being hanged.

Arc: Appears in memory as an angry and scandal-shaken father, then becomes a murder victim when he and Lucy are killed. His death is one of the incidents for which Andrew is initially suspected.

• Andrew 'Trey' Locke — his son
• Lucy Locke — his wife, also murdered
• Chloe Barrow Locke — his dead daughter-in-law

Andrew's mother, born Lucy Carmichael, who married Colonel Andy Locke and added inherited wealth to the family fortune. With her husband she withdrew from town life after their son was accused of murder. She is found murdered in the Lockes' kitchen, tied to a chair with her throat cut.

Arc: Is remembered as having once supported Eden after Eden's parents died, then as a scandal-shaken recluse. She dies before the present story's main investigation reaches its peak, deepening suspicion around Andrew.

• Andrew 'Trey' Locke — her son
• Colonel Andy Locke — her husband
• Eden Barrow — someone she and her husband cared for after her parents died

The Locke family's cocker spaniel, part of the household's happy morning chaos. Before the trip, he freezes and stares toward the woods, sensing danger. Later he is poisoned along with the household members but is brought into care by the EMTs.

Arc: Serves as an early sign of unease and later becomes another victim of Eden's poisoning plot. He survives the incident and remains part of the family.

• Brooklyn Locke — his owner
• Four (Andrew Edward Locke IV) — part of the family
• Neve — part of the family

A young man whose dying mother, Mabel, lives near the Lockes. While putting up Christmas decorations, he accidentally photographs a black SUV with two men and thinks he may have captured the Locke killer. He shares the photo with Theresa Lee.

Arc: Appears only as a witness whose phone photo gives law enforcement a key lead. He is comforted by Kevin while Theresa takes the image back to the station.

• Mabel Aikman — his dying mother
• Theresa Lee — the detective he gives the photo to
• Kevin (K-Swiss) — his old schoolmate

A crime-scene technician working with Theresa Lee. He finds Andrew Locke's passport at the Lockes' crime scene and collects prints and a blond hair from the rope. He also brings Theresa the tip about Keenan's photograph and stays behind to comfort Keenan.

Arc: Remains a secondary law-enforcement presence who assists Theresa with evidence and witness follow-up.

• Theresa Lee — his supervising detective
• Keenan — an old schoolmate he stays with after the interview

Theresa Lee's superior officer at the station. He arrives at the Locke crime scene, later reviews Keenan's photo of the black SUV, runs facial recognition, and orders Theresa to Nashville to interview Brooklyn Locke.

Arc: Plays a chain-of-command role, directing Theresa's movement from the Locke murder scene to the hospital where Brooklyn is recovering.

• Theresa Lee — her captain

A neighbor who brings a lasagna to the Locke house after Brooklyn comes home from the hospital. She tells Margot she thought she recognized Eden from a school pickup line around Halloween. Her observation helps turn Margot and Brooklyn against Eden.

Arc: Unknowingly provides key evidence that Eden was present in Nashville before she claimed to have met the family, exposing Eden's deception.

• Eden Barrow — the woman she claims to have seen in the school pickup line
• Margot Thomas — the neighbor she tells about the sighting

Brooklyn's longtime bank agent. She tells Brooklyn that Trey closed their account, took cash, made wire transfers, moved money into a Coinbase wallet, and had been making steady withdrawals for six months. She is empathetic but constrained by banking rules.

Arc: Appears briefly to reveal the financial theft that confirms Trey's disappearance was planned and leaves Brooklyn frozen out of the family funds.

• Brooklyn Locke — her client for over twenty years
• Andrew 'Trey' Locke — the person who submitted the paperwork to close the account

Andrew Locke's lawyer during Theresa Lee's interrogation after Chloe's murder. He stops the questioning when the interrogation becomes too much and later informs Theresa about Andrew's inheritance once probate moves through.

Arc: Functions only in the historical timeline, representing Andrew during the original murder investigation and feeding Theresa information about the inheritance trust.

• Andrew 'Trey' Locke — the client he represents
• Theresa Lee — the detective he deals with during the interrogation

The Nashville doctor who treats Brooklyn after her head injury and cardiac event. He examines her reflexes and memory loss, explains that her symptoms are normal after a severe concussion, and advises patience. He speaks from personal experience with a brain injury.

Arc: Helps Brooklyn understand that her memory gaps and hallucinations are part of recovery rather than signs of insanity.

• Brooklyn Locke — his patient
• Margot Thomas — the sister he updates about Brooklyn's recovery

The emergency physician at Grady Memorial who first treats Brooklyn after the SUV hit-and-run. She explains to Eden and Margot that Brooklyn has a severe concussion, some brain swelling, and needs to be monitored for the first critical twenty-four hours. She later becomes suspicious after Brooklyn's unexpected cardiac episode.

Arc: Provides the early medical assessment and orders more comprehensive blood work after Brooklyn nearly dies in the hospital, helping uncover the poison or drug at work.

• Brooklyn Locke — her patient
• Eden Barrow — one of the family members she updates
• Margot Thomas — one of the family members she updates

Andrew Locke's grandfather, an Air Force veteran who later worked at Lockheed and, according to family rumor, gained wealth through contacts with people seeking classified data for the Soviets. His background becomes part of Theresa and Drake's investigation into the origins of the Locke family fortune.

Arc: Does not appear in the present; his alleged espionage-era wealth is offered as background to explain the family trust and the criminal attention around Andrew.

• Colonel Andy Locke — his son
• Andrew 'Trey' Locke — his grandson