Bryn Harper, a bestselling self-help author, is spending the summer in Saratoga Springs, New York, in a rented Victorian house with her husband, Guy Carrington. Three months earlier, Bryn survived a devastating car accident on the Massachusetts Turnpike when Paul Dunham, the paperback director at her publishing house, lost control of the car and crashed at nearly 70 miles per hour. Paul died in the resulting fire; Bryn escaped with a broken arm and pelvis but retains almost no memory of the moments surrounding the crash.
Bryn is plagued by recurring nightmares of an unfamiliar hotel room filling with smoke. Her therapist, Dr. Greene, has diagnosed her with an acute stress reaction and believes the dreams relate to the accident. In the latest nightmare, an unseen man calls her name and urges her to wait. Bryn also has severe writer's block; she is supposed to be drafting a proposal for her next book but can barely write a sentence. Guy runs the development office for the local opera company. Their two-year relationship has been long-distance, and this summer marks their first extended time living together.
Two events unsettle Bryn. First, Sandra Dowd, a local PR professional claiming to represent the Saratoga Arts Council, arrives at the house with a welcome bag. Bryn goes upstairs to retrieve a signed copy of her book,
Twenty Choices, leaving Sandra alone on the ground floor. Then the couple hosts a dinner party for opera donors, catered by Eve Blazer of Pure Kitchen Catering. Among the guests is Derek Collins, a journalism professor at nearby Ballston College, who tells Bryn her book inspired him. After the party, Bryn opens her desk drawer to retrieve tip money and finds the cash gone, replaced by a box of kitchen matches burned to charred stubs. The scent of smoke evokes her accident trauma. Guy dismisses the matches as coincidence, but Bryn sees a deliberate threat.
Bryn confronts Eve, who denies involvement. The following Saturday, a caller claiming to work for Eve lures Bryn to the catering office, where Bryn discovers Eve's body on the floor with an ax embedded in her face. Detective Corcoran interviews Bryn at the scene. She explains the missing money but omits the burnt matches. When she tells Guy, his first concern is damage to his job. His assistant, Miranda Kane, casually mentions Eve catered a party at the house before Bryn arrived, a fact Guy never disclosed.
The investigation tightens. No one at Pure Kitchen admits to making the Saturday call, and the number traces to a disposable phone. Guy begins acting oddly: curt with detectives and distant from Bryn. He confesses that Eve invited him for drinks weeks before Bryn's arrival and came on to him. Bryn asks if he had an affair. Guy denies it but briefly averts his eyes. She orders him to move back to his apartment. Though she finds no proof of infidelity at his place, she detects an unfamiliar woodsy scent in the bedroom. She calls Miranda, who verifies Guy's claim that he tried to replace the caterer. Partially reassured, Bryn texts Guy that she loves him.
The truce is short-lived. Bryn discovers a voicemail from lawyer Chip Maycock referencing an urgent meeting with police. She confronts Guy outside the law firm, and he admits the police have flagged a sexually suggestive text he sent Eve. Bryn demands Guy move out. She begins sleeping alone in the house.
Her recurring nightmare evolves: She finally sees the man's face. It is Paul Dunham, whispering for her to listen. Her agent, Casey, reveals rumors at the publishing house that Bryn and Paul were having an affair. Bryn drives to visit Paul's widow, Stephanie, in Hastings, New York. Stephanie shows her a photograph of Bryn and Paul hidden under Paul's desk blotter and mentions Paul spoke Bryn's name in a conversation with his college friend Gavin Bloom, a lawyer in Dallas.
Bloom initially deflects but calls back the next day with the truth: Guy had lived in Dallas under the name Rich Carrington, serving as president of a charity called Dallas Gives, and was fired for embezzling close to $150,000. A Dallas
Business Journal item with Guy's photograph confirms the story. A faint memory surfaces: Paul reaching across the car seat, saying he has something upsetting to tell her.
One night Bryn wakes to someone forcing open the porch door. Almost simultaneously, she receives a phone call playing the crackling sound of fire. She calls Derek, who stays the night. The next morning she moves to the Saratoga Arms inn. She confronts Guy in Congress Park, where he claims false accusation in Dallas but grows hostile, grabbing her arm and demanding to know if she has told Miranda about his past. Frightened, Bryn pulls free and tells him she has already moved out.
Throughout this period, Sandra cultivates a friendship with Bryn, sharing gossip that Eve's married lover called his wife "extremely fragile" and said she had "sucked all the joy from his life." She arranges a lunch at a lakeside restaurant, where Miranda happens to be dining at a nearby table. Soon after, Corcoran summons Bryn to the station and accuses her of fabricating the mystery phone call. Days later, Miranda is found bludgeoned to death in her driveway.
Sandra invites Bryn to the shuttered Washington Baths for an event preview and gives her a swag bag. Inside, Bryn finds a sandalwood candle and recognizes the scent as the same unfamiliar smell from Guy's bedroom. The realization strikes: Sandra has been in Guy's apartment. She has been sleeping with Guy. She was also alone on the ground floor long enough to steal the money and plant the burnt matches, and she knew about the accident from Guy. She had every reason to torment Bryn.
When Bryn's expression changes, Sandra blocks her path. Her real name is Lisa Wallins. She confesses: She left the matches and stole the cash to exploit Bryn's trauma; she murdered Eve in a jealous rage because Guy was becoming obsessed with the caterer; she killed Miranda because Miranda spotted Sandra and Bryn at the restaurant and would have mentioned it to Guy, exposing their connection. Lisa reaches for a claw hammer. Bryn hurls the candle at Lisa's face and runs, but the corridor ends at a padlocked exit. She climbs into a metal laundry chute and slides to the basement, spraining her ankle. She calls 911 and hides until police arrive.
At the station, with attorney Tina Oliver beside her, Bryn provides a full statement, including the burnt matches. Lisa Wallins is apprehended and charged with both murders; DNA evidence ties her to the ax, and her record reveals two prior stalking charges. A private investigator confirms Guy's embezzlement in Dallas and an earlier firing in Chicago for misusing a business credit card. Guy is fired from the opera company. Bryn returns to Manhattan, begins divorce proceedings, and resumes writing her book proposal about reinvention.
Four weeks later, Bryn returns to Saratoga for a meeting with the district attorney and a picnic with Derek at the site of the Revolutionary War's Battle of Saratoga. Derek plans to move to New York City and asks to see her. Bryn, cautious but hopeful, agrees to a long lunch at the end of the summer.
On the drive back to Albany, Bryn swerves to avoid a squirrel, and the near-miss triggers a flood of recovered memories. Paul had just told her about Guy and Dallas. She sat in stunned silence. A dog ran across the highway. Paul swerved and lost control. The crash was nobody's fault. The nightmares, she understands now, were her unconscious mind's persistent effort to restore what Paul had tried to tell her.