When Isabel Gallagher is found murdered on the floor of her baby's nursery by her mother, it's a gruelling case for Detective Lottie Parker. Isabel's pyjamas have been ripped, her throat cut and an old-fashioned razor blade placed in her hand. As Lottie looks at the round blue eyes and perfect chubby cheeks of Isabel's baby daughter, she can't understand who would want to hurt this innocent family. That very same day she receives a call with devastating news. Another young mother, Joyce Breslin, has gone missing, and her four-year-old son Evan has been abducted from daycare. Lottie is sure that the missing mother and son are linked to Isabel's death, and when she finds a bloody razor blade in their house, her worst fears are confirmed.