How to Cheat Your Own Death

How to Cheat Your Own Death (2026) is the third installment in the Castle Knoll Files series by Kristen Perrin. Perrin established her reputation with the series’ debut, How to Solve Your Own Murder (2024), which was a New York Times bestseller and a Good Morning America Buzz Pick. This novel continues the series’ blend of cozy mystery with a dual-timeline historical narrative and psychological-thriller elements. The story follows amateur sleuth Annie Adams, who is drawn from her quiet country estate into a dangerous investigation in London, and explores themes including The Ethics of Vigilante Justice, as characters bypass a corrupt system to enact their own revenge. The story also examines The Power and Risks of Forging a New Identity, as several women attempt to escape oppressive circumstances by reinventing themselves. Finally, the novel uncovers Exploitation of Vulnerable Populations, revealing how institutional power can mask cruelty toward those society has deemed disposable.

This guide refers to the 2026 Dutton edition.

Content Warning: The source material and guide feature depictions of death, animal death, graphic violence, sexual harassment, physical abuse, emotional abuse, gender discrimination, antigay bias, suicidal ideation, substance use, and cursing.

Plot Summary

Aspiring writer Annie Adams is living at Gravesdown Hall, the estate in Castle Knoll, England, that she inherited from her late great-aunt Frances Adams. She reflects on a cryptic fortune from the local seer, Peony Lane (which was received in a previous novel in the series). The fortune warns, “Without its beating heart, your family will fall one by one” (7). Her concern grows when her mother, Laura Adams, a famous artist, calls from her Chelsea home in London to report that an animal heart has been left on her doorstep. Laura also mentions that she has a new apprentice, Felicity “Fliss” Rowe, who happens to be from Castle Knoll. 

Worried, Annie travels to London, where she makes a horrifying discovery: Fliss is dead in a dumpster behind the house, her chest empty where her heart should be. Her body lies on a stack of what Annie recognizes as her mother’s valuable early paintings, wrapped in garbage bags.

As the investigation into Fliss’s death begins, Annie and her friend Detective Rowan Crane uncover a web of secrets that stretches back decades, connecting Fliss’s murder to a cold case detailed in Frances’s diaries from 1968. Crane reveals that Fliss, who is revealed to be his ex-girlfriend, had been trying to contact him before her death, leaving a message that she’d “made a terrible mistake” (50). 

Annie continues to read Frances’s diaries to uncover more about the cold case, reading about Frances’s time as a psychology student at University College London. In 1968, Frances befriended a socialite named Vera Huntington, who was married to a much older, controlling heart surgeon, Dr. Alasdair Huntington. Frances also clashed with Vera’s arrogant brother, Max Torrence, and befriended his on-again, off-again girlfriend, Elaine Cook. 

Frances’s diary recounts how Vera, paranoid that someone wanted to harm her, asked Frances to hide some of her valuables—including a diamond tiara and a large collection of her paintings—at the Chelsea house. Just before she was murdered, Vera met Frances at a jazz club, whispering that someone would kill her. The case culminated with Vera being found dead with her heart surgically removed, her husband convicted of the murder, and Frances herself briefly arrested after incriminating evidence was planted in her apartment.

The present-day investigation takes a turn when Annie’s estranged father, Sam Arlington, becomes an active part of Laura’s life. He claims to Annie that Laura’s fortune didn’t come from her art but from something valuable that he found in the Chelsea house, after Laura inherited it from Frances, and later sold. He says that Laura got upset about this and gave away the entire fortune, leading to their divorce.

Crane and Annie’s research proves that this is a lie, forcing Laura to confess the true, more complex fraud. Years ago, Sam discovered Vera’s canvases in the attic of the Chelsea house, forged Laura’s signature over Vera’s, and sold them as Laura’s work without her knowledge, launching her career. Laura filed for divorce from Sam, and soon after, an anonymous blackmailer threatened Laura’s and Annie’s lives, forcing Laura to donate the millions she earned to the Knightsbridge Nymph Art Gallery. 

Annie visits the gallery and discovers that Fliss’s sculptures are on display there and that the gallery is run by a hostile Max Torrence and a volunteer named Marie. She also discovers that the blackmailer’s emissary was a man named Brian Folkestone. Brian later contacts Crane under a false identity, saying that he has information: His sister, Susan, was a victim of experimental surgeries that Vera’s husband, Dr. Huntington, performed on unhoused people. He reveals that he murdered Dr. Huntington in prison on Max’s orders. Annie and Crane also look further into Vera’s 1968 autopsy, which reveals signs of heavy-metal poisoning, suggesting that the official cause of death was wrong and prompting a court-ordered exhumation.

Annie develops a theory that Vera faked her own death; killed a woman named Marie Cavanaugh, who was her husband’s nurse, and assumed her identity; and framed her husband for her murder. This is confirmed when Brian lures Annie to the Barbican Centre, where Laura’s new art exhibition is being prepared, claiming that Laura is in danger. He ambushes her, holding a knife to her throat. He confesses that he murdered Marie to avenge his sister’s death and also for Vera, claiming that he loves her. He’s also the one who has been blackmailing Laura. Just as he’s about to kill Annie, Sam, who has been secretly following her to protect her, intervenes. In the ensuing struggle, Sam fatally stabs Brian.

Sam tells Annie that Brian must have murdered Fliss after she discovered the art fraud and contacted him about Vera’s paintings. Sam also reveals that he was in prison for years under an alias, which is why he stayed away. Knowing that his own criminal past will make him untrustworthy to the police, he insists that he has to leave. To protect him, Annie lies to the officers, claiming that she killed Brian in self-defense. The authorities accept her story. Vera, now exposed, arrives at the scene and tells Annie that Brian was likely the one who left the animal hearts. She faces lesser charges for fraud and identity theft, ultimately embracing her new status as a pop-culture curiosity. 

With the truth revealed about Dr. Huntington’s unethical experiments, Annie curates a successful museum exhibition honoring his forgotten victims. She begins receiving occasional postcards from Sam, who is on the run. Her burgeoning relationship with Crane stalls when he confesses that he’s being stalked by an anonymous killer from an old case and must push her away for her own safety. The story ends at the opening of Annie’s exhibition, where she finds one of the Peony Lane fortunes she had thrown away—one bearing Crane’s name—mysteriously returned to her. Realizing that Crane is in danger, she resolves to go back to Castle Knoll.