Cassie Hobbs joined the federal Naturals program with one goal: to uncover the truth about her mother's murder. But now everything Cassie knew about what happened that night is called into question. Her mother is alive and is being held captive by people far more powerful—and dangerous—than anyone the Naturals have encountered before. While trying to uncover the secrets of a group that has been secretly killing people for generations, Cassie and her team discover that they have little time. New victims. New betrayals. New secrets. With each new corpse, it becomes clear that this time the Naturals are not just hunting serial killers.