Someone Else's Husband

Kimberly McCreight’s Someone Else’s Husband (2026) is a psychological thriller from the New York Times bestselling author of novels including Reconstructing Amelia and A Good Marriage. The novel follows Gretchen Falk, a wealthy woman whose carefully constructed life on New York’s Upper East Side is shattered when her husband, Richard, is arrested for the murder of a young artist he met on a recent expedition to Mount Kilimanjaro. As the investigation deepens, Gretchen is forced to confront long-buried secrets about her marriage, her family, and herself in a desperate attempt to uncover the truth. The narrative explores themes such as The Weaponization of Silence, Willful Ignorance in Marriage, and Wealth as a Shield.

McCreight employs a fragmented, nonlinear narrative structure, alternating between Gretchen’s perspective in as she deals with the fallout of the arrest, and chapters from Frankie’s perspective before Richard’s arrest. These primary narratives are punctuated by interludes of official documents, including police interviews, grand jury transcripts, and private journal entries, which present conflicting accounts of the events leading to the crime. This complex structure challenges the reader to piece together the truth from a mosaic of subjective, and often unreliable, testimonies. The novel’s setting on Mount Kilimanjaro was inspired by the author’s own experience as the only woman on an all-male climbing expedition.

This guide refers to the 2026 Alfred A. Knopf hardcover edition.

Content Warning: The source text and this guide contain depictions of graphic violence, sexual violence and rape, substance use, disordered eating, cursing, and death.

Plot Summary

The lives of Gretchen Falk and her husband, Richard, are thrown into chaos when police storm their Upper East Side co-op with a search warrant. They learn that Frankie Callahan, a young painter Richard met on a recent expedition to climb Mount Kilimanjaro, has been murdered and Richard is the primary suspect. Richard is taken for questioning, where he admits to being friends with Frankie but denies any wrongdoing. Gretchen, left to wait for hours, grows increasingly frantic. Her anxiety proves justified when Richard is formally arrested for murder. The family’s estates lawyer, Bruce Barone, informs her that the police have an eyewitness placing Richard near Frankie’s apartment, as well as incriminating statements Richard made under questioning. 

The narrative shifts to the weeks before the murder, following Frankie Callahan as she prepares for her first major solo gallery show. Feeling the need for a personal milestone, she joins a guided climb of Mount Kilimanjaro. There, she is the only woman in a group with four close-knit college friends: the charismatic and wealthy Richard; the affable lawyer Scotty Kaplan; the nerdy and intense Brooks Grace; and the warm-hearted former NFL player Van. Frankie and Richard feel an immediate and powerful connection, which deepens as they ascend the mountain.

Richard is denied bail at his arraignment after the prosecutor reveals the police also found a pair of his pants, stained with Frankie’s blood type, in the building’s garbage. Richard is sent to Rikers Island, leaving Gretchen to navigate the fallout with their three adult children—Cassandra, Elizabeth, and Becks—and a high-powered criminal defense attorney, Mikey Pearce. As Gretchen tries to hold her family together, she discovers Richard’s hidden travel journal which, she believes, reveals a dissatisfaction with his life and a fixation on Frankie that began during their trip to Africa.

In New York, before Richard’s arrest, Richard and Frankie struggle to let go of their connection, meeting for coffee and dinner. Frankie’s life is complicated further when she begins receiving anonymous, threatening texts from someone who seems to be Senator Adam Foley, a powerful politician who sexually assaulted her as a teenager. The harasser sends her a photo of her and Richard, threatening to expose them. Shortly after, Frankie’s art studio is vandalized with spray paint, and she finds her new paintings slashed.

In the time after the arrest,, Gretchen’s search for answers becomes a desperate attempt to protect her family. She learns from Richard’s assistant, Deborah, that a distraught woman—later revealed to be Frankie’s best friend, Hilary Kaplan, who is also Scotty’s wife—came to Richard’s office to confront him about the affair. Believing Richard is cheating, Gretchen hires men through her Pilates instructor, Ilya, to scare Frankie away, a plan set in motion before the murder. When she meets them to deliver a $50,000 cash payment—obtained by selling a lavish Cartier watch Richard gave her.

In Africa, tensions simmer among the men over business dealings, particularly a lucrative sale of Van’s restaurant chain in which the others are early investors. The trip ends in tragedy when Van falls to his death from a treacherous ridge. Following Van’s death, a grieving and intoxicated Richard and Frankie almost have sex in her tent but are interrupted.

The hired men reveal they found Frankie already dead and threaten Gretchen’s children if their involvement is ever discovered. Her son, Becks, then confesses a secret of his own: upset about the potential affair, he followed Richard and Frankie, and later, with his troublemaking friend Luke, vandalized Frankie’s studio using spray paint. Gretchen finds the spray paint cans hidden in a closet, confirming his story and fearing he may be more deeply involved. 

Gretchen confronts Richard at Rikers, where he confesses to a one-night stand years ago and to developing romantic feelings for Frankie. He insists, however, that he did not kill her. He explains that he went to Frankie’s apartment, found her already dead in a pool of blood, and panicked, attempting to clean up the scene and dispose of his blood-stained pants to protect Gretchen, whom he suspected of involvement after discovering the spray paint.

The climax of the novel unfolds on the night of the murder. After discovering cans of spray paint in Richard’s apartment that match those used to vandalize her studio, Frankie believes Richard is not who he seems. Scared and confused, she returns to her own apartment, determined to call the police and report everything. As she prepares to make the call, she is ambushed. Her attacker is not Richard or Senator Foley, but Brooks Grace. Brooks reveals he has been stalking both Frankie and Gretchen, his childhood friend with whom he is obsessed. He orchestrated the harassment, using his knowledge of Senator Foley’s past to terrorize Frankie. His plan is to force Frankie to help him break up Richard’s marriage so he can be with Gretchen. He implies that he was responsible for Van’s death on the mountain, which financially benefited him after a disastrous business deal. Realizing he intends to kill her, Frankie grabs a painter’s scraping knife. In the ensuing struggle, she stabs Brooks in the neck, killing him. 

In the aftermath, Frankie calls her friend, Noah, for help. While he disposes of the body, Frankie flees the country. The police, arriving at a bloody crime scene with no body, initially believe Frankie is the victim. Richard’s texts, the eyewitness who saw him at the apartment after the murder, and Brooks’s blood on his pants lead to his arrest. When DNA evidence reveals the victim was Brooks Grace, not Frankie Callahan, the murder charges against Richard are dropped. Frankie, now a fugitive, is charged in absentia with Brooks’s murder. Richard pleads no contest to tampering with evidence and serves an 18-month sentence. 

Two years later, Gretchen is enrolled in law school at NYU. She and Richard are separated and a reconciliation seems unlikely. Frankie, living in Europe under the name Thalia Noah, has become a celebrated but anonymous painter. At the Venice Biennale, where her work is being exhibited, she reflects on her traumatic past and the violent act that gave her a strange, new freedom. Watching the Parisian gallery owner who champions her work, she contemplates a future with hope and decides it is time to step out of the shadows and into the light.