A shocking thriller by the bestselling author of Girls of Glass. It seems like an open-and-shut case for FBI special agent Lucy Thorne when Eliza Cook walks into the field office. The teenage girl confesses to murdering a young boy. Disturbingly composed, she reveals chilling details only the killer could know. Beyond that Eliza doesn't say another word, leaving a vital question met with dead silence: Why did she do it?To find the answer, Lucy goes to the scene of the crime in the small Idaho town of Knox Hollow. But Lucy's questions are only mounting. Especially when she's drawn deeper into the life of the victim. Then a combing of the woods yields unsettling evidence that Eliza isn't the only one in this close-knit rural community with secrets. Getting to the truth is becoming Lucy's obsession. And it's a dangerous one. Because for the good folks of Knox Hollow, hiding that truth will take more than silence.