Emma Carpenter lives in isolation with her golden retriever Laika, house-sitting an old beachfront home on the rainy Washington coast. Her only human contact is her enigmatic old neighbor, Deek, and (via text) the house’s owner, Jules. One day, she reads a poorly written—but gruesome—horror novel by the author H. G. Kane, and posts a one-star review that drags her into an online argument with none other than the author himself. Soon after, disturbing incidents start to occur at night.

Ana and Reid needed a lucky break. The horrifically complicated birth of their first child has left Ana paralyzed, bitter, and struggling: with mobility, with her relationship with Reid, with resentment for her baby. That's about to change with the words any New Yorker would love to hear—affordable housing lottery. They've won an apartment in the Deptford, one of Manhattan's most revered buildings. Reid dismisses disturbing events and Ana’s deep unease and paranoia as the price of living in New York—people are odd—but he can't explain the needle-like bite marks on the baby.

Julie is missing, and no one believes she will ever return - except Elise. Elise knows Julie better than anyone, and feels it in her bones that her best friend is out there and that one day Julie will come back. She’s right. Two years to the day that Julie went missing, she reappears with no memory of where she’s been or what happened to her. Along with Molly and Mae, their two close friends from college, the women decide to reunite at a remote inn. But the second Elise sees Julie, she knows something is wrong - she’s emaciated, with sallow skin and odd appetites.

The last time Maeve saw her cousin was the night she escaped the cult they were raised in. For the past two decades, Maeve has worked hard to build a normal life in New York City, where she keeps everything—and everyone—at a safe distance. When Andrea suddenly reappears, Maeve regains the only true friend she’s ever had. Soon she’s spending more time at Andrea’s remote Catskills estate than in her own cramped apartment. Maeve doesn’t even mind that her cousin’s wealthy work friends clearly disapprove of her single lifestyle.

Lee Gulliver never thought she’d find herself living on the streets—no one ever does—but when her restaurant fails, and she falls deeper into debt, she leaves her old life behind with nothing but her clothes and her Toyota Corolla. In Seattle, she parks in a secluded spot by the beach to lay low and plan her next move—until early one morning, she sees a sobbing woman throw herself into the ocean. Lee hauls the woman back to the surface, but instead of appreciation, she is met with fury.