When a bombing rocks New York City, former Marine Hunter Stevens and his team at Southerly—a new NSA surveillance program listening to Americans through their smart devices—race to track down those responsible. But when Hunter's daughter vanishes without a trace during the investigation, he makes a desperate choice to exploit the system’s vast surveillance network to find her. The decision sets off a chain reaction—exposing corruption, betrayal, and a deeper conspiracy within Southerly itself.

FBI agent Sarah Cole is stunned to receive an invitation to the “Game of Nines,” the most secretive and longest-running murder puzzle in history. Thrust into a mystery that has confounded law enforcement for decades, she proves to be an unexpectedly formidable "player"—and might finally end the deadly game once and for all.

Two high school teachers—Amber Dorris and Leticia Laye—become obsessed with a true-crime podcast about the 1999 murder of 12-year-old Sarah Gerlach. Amber’s marriage to her real estate agent husband Gary is on the rocks. As a distraction, she and Letitia become increasingly absorbed by the case against local Blake Wernerhet. Blake was convicted of murdering Sarah, who was the little sister of a friend of his. While he maintains his innocence, everything points to this man being a vicious killer of an innocent girl.

In 2010, Brooke Lowry, Carrie Hollis, and Eve Shay were inseparable. But on the Fourth of July, Eve vanished—her case never solved. Brooke moved away, but Carrie couldn’t let go, her obsession driving her to become the Chief of Police. Now, fifteen years later, just as Carrie is about to close Eve’s case for good, an anonymous call provides a chilling new lead. And–within days–a man’s body is hauled in by a fishing boat. His murder is linked to a hotel a few miles away–where the guest in the room next door was none other than Brooke Lowry.

On the Yorkshire moors, celebrated author Faye Mathis is coming to terms with her early-onset dementia. She has begun writing her memoir, committing her past to paper before her memory betrays her. But her family history is full of gaps, bloodlines cut short, family ties all ending in knots. When a picture of Faye – dirty and dishevelled, stumbling alone on the moors – goes viral, her life is thrown into chaos. Faye is convinced she is not that person in the photograph. But how can she be sure?