The likeness
(Book)

Six months after the events of In the Woods, Detective Cassie Maddox is still trying to recover. She's transferred out of the murder squad and started a relationship with Detective Sam O'Neill, but she's too badly shaken to make a commitment to him or to her career. Then Sam calls her to the scene of his new case: a young woman found stabbed to death in a small town outside Dublin. The dead girl's ID says her name is Lexie Madison--the identity Cassie used years ago as an undercover detective--and she looks exactly like Cassie.--From publisher description.