This book is the second in the Olde Locke Beach Mysteries series. It is about a young girl named Rachel and a young boy named Will. These two friends take care of houses while people are away. They water plants, take care of pets, and take in their mail. One summer a burglar named "Jigsaw" breaks into houses and takes all of the people's most prized and expensive possessions. He always seems to know when people are out of town, and he leaves behind jigsaw puzzle pieces as clues. Rachel and Will want to try and find out who Jigsaw is before he starts robbing houses near them, so they decide to take matters into their own hands and try to solve the mystery all by themselves.