When Detective Cassie Maddox transferred out of Dublin's Murder Squad at her own request, she vowed never to return Then her boyfriend, Detective Sam O'Neill, calls her to a murder scene in Glenskehy It isn't until Cassie sees the body that she understands Sam's insistence The dead girl is her double, and carries ID identifying her as Alexandra Madison, an alias Cassie used when she worked undercover But who killed this girl, and who was she? Having played Lexie once before, Cassie is in the perfect position to take her place and lure out her killer