I read this book on TumbleBook Cloud High.

It is the story of eight trouble teens, who are dropped off on a remote island for a week long treatment program.  The eight teens and three camp counselors are the only ones on the island.

One teen ends up missing, someone else ends up dead.  The question is who did it?  Each teen has a troubled past so all are suspects.

The story is told by two of the teens, Alice and Caleb.  It is a fast and fun read with a surprising ending.