In the FBI’s Naturals program, Cassie Hobbes has found a family and a purpose—but she’s never lost sight of her original goal to uncover the truth about her mother’s murder. Now she’s reeling from a stunning discovery: Lorelai Hobbes is alive, and held captive by a powerful and twisted cult of serial killers who call themselves the Masters. Their bloody legacy stretches back generations, and Cassie fears that they will have twisted her beloved...