This is the follow-up to French's In the Woods, and features one of the same characters, Detective Cassie Maddox. The body of a woman is found in an old stone cottage outside of Dublin, and the dead woman and Cassie are identical. Even more bizarre, the name on her college I.D. is the same as one of the fake names that Cassie went by as an undercover cop several years back. The police report the victim to be injured but alive, allowing Cassie to go undercover once again, to step into the life of her doppelganger, into the lives of her four housemates, in an attempt to uncover the truth.
The book was totally engrossing. I can't remember the last time I was so rapt up in a book that I didn't want to put it down, and more importantly, that I didn't want it to end.