Julia and Sienna Larkin are sisters-in-law, connected by Julia’s husband and Sienna’s brother, Jason. More than that, the two are devoted best friends and business partners. Recently, Jason has been putting in long hours to secure a promotion at work, so when his boss is found brutally murdered --- his lips sewn shut --- the Larkins are shocked and unsettled, especially as local gossip swirls. A few days later, Julia and Sienna’s lives are upended when Jason gets into a car accident and is placed in a medically induced coma. Worse, the police arrive with news that he’s the prime suspect in the murder investigation. With Jason unable to respond --- and with Julia and Sienna working to clear his name --- the two women find their friendship threatened for the first time.

Raised in a secluded island mansion deep in the woods and kept isolated by her true crime-obsessed parents, Dahlia Lighthouse is unable to move beyond the disappearance of her twin brother, Andy, when they were 16. After several years away and following her father’s death, Dahlia returns to the house, where the family makes a gruesome discovery: buried in their father’s plot is another body --- Andy’s, his skull split open with an ax. Dahlia is quick to blame Andy’s murder on the serial killer who terrorized the island for decades, while the rest of her family reacts to the revelation in unsettling ways. As Dahlia grapples with her own grief and horror, she realizes that her eccentric family, and the mansion itself, may hold the answers to what happened to her twin.

When Fern Douglas sees the news about Astrid Sullivan, a 34-year-old missing woman from Maine, she is positive that she knows her. And when Astrid appears in Fern’s recurring nightmare --- one in which a girl reaches out to her, pleading --- Fern fears that it’s not a dream at all, but a memory. Returning to her childhood home to help her father pack for a move, Fern purchases a copy of Astrid’s recently published memoir and discovers more evidence that she has an unsettling connection to the missing woman. With the help of her psychologist father, Fern digs deeper, hoping to find evidence that her connection to Astrid can help the police locate her. But when Fern discovers more about her own past than she ever bargained for, the disturbing truth will change both of their lives forever.

Sylvie’s sister, Persephone, was killed 16 years ago, yet her murder remains unsolved. In the present day, Sylvie returns home to care for her estranged mother, Annie, as she undergoes treatment for cancer. Their once-close bond dissolved in the weeks after their loss, making for an uncomfortable reunion all these years later. Worse, Persephone’s former boyfriend, Ben, is now a nurse at the cancer center where Annie is being treated. Sylvie has always believed Ben was responsible for the murder, though she also carries her own guilt about that night. As she navigates the complicated relationship with her mother, Sylvie begins to uncover the secrets that fill their house --- and what really happened the night Persephone died.