"Nash's father was arrested for the brutal murder of four teenagers last Halloween. Penny's parents have forbidden her to have anything to do with Nash or his family. It's hard not to think of what happened as spooky season gets underway. Going to the Halloween store to find costumes, Penny and her friends find a girl from school bleeding out on the floor of a dressing room. Stabbed. Is a copycat killer on the loose? People are quick to blame Nash and his sister Grace, but Penny has her own suspicions." -- Adapted from back cover.