Mallory, eighteen months sober, interviews for a nanny position with the Maxwell family through her recovery sponsor Russell.

Ted initially rejects Mallory due to her drug history but relents after Teddy instantly bonds with her at the interview.

Mallory moves into the Maxwells' guest cottage and bonds with Teddy through imaginative games in the Enchanted Forest.

Teddy's drawings begin featuring a frightening woman named Anya, a special friend who sings under his bed at night.

Neighbor Mitzi warns Mallory that a woman named Annie Barrett was allegedly murdered in the guest cottage decades ago.

A hidden baby monitor captures Teddy convulsing with white eyes during Quiet Time, then drawing with his non-dominant right hand.

Mallory and Mitzi conduct a spirit board séance while Adrian watches Teddy; the planchette moves frantically on its own.

Mallory falls asleep for four unsupervised hours and wakes to find walls covered in Anya's drawings and her right hand smeared with charcoal.

Ted reveals Mallory's addiction history to Adrian; the Maxwells fire Mallory, though a drug test confirms she has not relapsed.

Detectives inform Mallory that Mitzi has been found dead and that Annie Barrett's murder was a fabricated story covering her escape.

At the farewell party, Teddy tells Mallory he has never been on an airplane, directly contradicting the Maxwells' story about flying from Barcelona.

When Mallory confronts the Maxwells about the Barcelona lie, Ted strikes her with a wine bottle and she wakes bound to a chair.

Caroline confesses she used a stun gun on Hungarian woman Margit Baroth, strangled her during a seizure, and stole her daughter Flora.

Caroline injects Mallory with what she believes is heroin; Ted reveals he swapped it for baby powder, then Caroline shoots Ted.

Margit's spirit takes control of Teddy to stab Caroline; Mallory claims responsibility for the killing and Flora is reunited with her father.

Mallory Quinn, a recovering addict, takes a summer nanny job with the Maxwell family in Spring Brook, bonding instantly with five-year-old Teddy and moving into a guest cottage with a troubled past. Teddy's disturbing drawings of a ghost named Anya begin to alarm Mallory, who becomes convinced the spirit is real and trying to communicate through the child. After setting up a hidden baby monitor and conducting a séance, Mallory is caught by the Maxwells and fired for leaving Teddy unsupervised during a four-hour blackout. When detectives reveal that the cottage's alleged murder victim Annie Barrett was never killed, Mallory must rethink the source of the haunting entirely. A slip in Teddy's story about a plane ride leads Mallory to confront the Maxwells, which cracks everything open and exposes a kidnapping and murder they have been hiding for years. The truth reveals that the Maxwells stole a Hungarian woman's daughter and killed her, and it is the dead mother's spirit who has been drawing through Teddy — and ultimately through Mallory — to seek justice.

The central mystery of Teddy, Anya, and the Maxwells' dark secret.

As a teenager, Mallory volunteers for a male gaze research study and correctly identifies when she is being watched with 97% accuracy.

Caroline presents Mallory with a list of house rules forbidding overnight guests, religious discussions, and too much screen time for Teddy.

Mallory lies to landscaper Adrian, claiming to be a Penn State cross-country runner on a full scholarship.

Ted joins Mallory in the pool late one night and grows flirtatious, noticing the Gritty mascot tattoo on her side.

A possum is discovered living under the cottage floor, and Ted immediately nails the access panel shut.

On July 4, Mallory meets Adrian's parents at the Flower Castle and extends her lie about being a Penn State runner.

Mallory visits Mitzi's house and finds an empty Oxycontin bottle in the medicine cabinet, reigniting her addictive impulses.

Mallory notices charcoal smudges on Teddy's hands after Quiet Time but searches his room and finds no new drawings.

Russell visits the cottage, Mallory passes a drug test, and new drawings appear on her refrigerator held by magnets during his visit.

Adrian's mother Sofia presents Mallory with a self-published booklet of Annie Barrett's collected paintings, compiled by her disapproving cousin George.

Adrian drives Mallory to her estranged mother's house, but she refuses to go inside; they go to a park where she tells him about Beth's death.

Mallory and Adrian break into Mitzi's empty house and find hypodermic needle caps scattered on the floor just before detectives arrive.

Adrian agrees to sleep on the cottage floor and keep watch while Anya uses Mallory to communicate through drawings.

Adrian visits Rest Haven retirement community and contacts Annie Barrett's grandson Curtis, who reveals Annie escaped alive with her Black lover.

One year later, Mallory visits Flora and her father Jozsef; Flora gives Mallory a pamphlet, revealing the entire book was written for Flora.

Before Mallory arrives at the Maxwells' home, her unusual sensitivity to being watched is established through a remarkable university research study. Once working as a nanny, she builds a fragile relationship with landscaper Adrian while concealing her past, and encounters neighbor Mitzi, whose hints at supernatural forces are matched by a temptation toward relapse when Mallory finds an empty Oxycontin bottle in her medicine cabinet. Small but meaningful moments — charcoal smudges on Teddy's hands, new drawings appearing on her refrigerator, a self-published booklet about Annie Barrett — deepen the mystery and sharpen Mallory's determination. After being fired, Adrian becomes her closest ally, accompanying her to unravel Annie's true story and standing by her as she finally opens up about her sister Beth's death. Together they piece together the final clues through break-ins and retirement home visits, and a year after the events of the summer, Mallory delivers her account of everything that happened in the form of a book written directly for the girl who was once called Teddy.

The people and moments surrounding Mallory's investigation.

Mallory searches for records of the male gaze research study but finds nothing, leading her sponsor Russell to suggest she may have false memories.

Teddy spontaneously hugs Mallory and gives her a drawing of the two of them together, shifting Ted's decision about hiring her.

Teddy tells Mallory that a new drawing depicts the man who stole Anya's little girl, hinting that the story describes a real crime.

Mallory finds nine increasingly skilled drawings hidden in Teddy's trash, far too advanced for a five-year-old to have created.

Adrian compares the drawings to hidden pictures in Highlights magazine and suggests Anya is learning to draw using someone else's arm.

The baby monitor captures an unfamiliar voice saying hello in Teddy's supposedly empty room before the screen glitches.

Mitzi abruptly ends the séance, accuses Mallory of inventing the whole story for attention, and leaves in a hurry claiming no spirits are present.

Mallory returns from a date to find Ted drunk in her bed, revealing his romantic obsession and his cold, separate-bedroom marriage to Caroline.

Caroline dismisses the wall drawings as a psychological metaphor for Mallory's unresolved grief over her dead sister Beth.

Mallory and Adrian decode the spirit board letters as Hungarian, revealing the message: YES BEWARE THIEF HELP FLOWER.

Detective Briggs reveals Mitzi's final unfinished text said Anya is not a name, suggesting Mitzi had discovered its true meaning before she died.

Mallory sees Teddy in the outdoor shower and realizes Teddy is anatomically female, confirming her deepest suspicions about the Maxwells' deception.

Bound in the cottage and drifting from the injection, Mallory hallucinates Margit Baroth's spirit telling her the car accident was not her fault.

Ted enters the cottage and reveals he swapped the heroin for baby powder, then declares his plan to flee with Mallory to Whidbey Island.

Mallory reconciles with her estranged mother, and Flora chooses to live as a girl, reclaiming her identity with her father Jozsef.

From the novel's opening, questions about the reliability of Mallory's memory and perception set the stage for a story built on hidden truths and shifting certainties. Each revelation — from Teddy's drawings hinting at a real crime, to the decoded Hungarian message on the spirit board — escalates the tension and forces both Mallory and the reader to rethink what they thought they knew. Moments of apparent failure, such as Mitzi's sudden departure from the séance and Caroline's psychological dismissal of the wall drawings as grief metaphors, become turning points that push Mallory deeper into the investigation rather than driving her away. The night Ted is found drunk in Mallory's bed begins to expose the rot at the heart of the Maxwell marriage, foreshadowing the confessions that follow. The climax pivots on rapid-fire revelations: Teddy's true anatomy, the heroin swap, and Margit's final act of possession through Teddy's body. The resolution sees Mallory absolved of guilt by Margit's spirit and Flora freed from captivity, with both moving forward toward healing and a reclaimed identity.