Marissa Dahl, a shy but successful film editor, travels to a small island off the coast of Delaware to work with the legendary – and legendarily demanding – director Tony Rees on a feature film with a familiar logline. Some girl dies. It’s not much to go on, but the specifics don’t concern Marissa. Then she meets the intrepid and incorrigible teenage girls who are determined to solve the real-life murder that is the movie’s central subject, and before long, Marissa is drawn into the investigation herself. The only problem is, the killer may still be on the loose. And he might not be finished.