Max is thrilled when he discovers a mirror in his attic that can make him invisible, but his fun turns to fright when his disappearances begin to last longer than he wants.
Lucy has always liked to tell monster stories, so when she actually does discover the librarian in charge of the summer reading program really is a monster, no one believes her.
Billy learns a very dangerous lesson when he ignores his uncle Dr. Deep's warning to stay away from the coral reefs while diving and encounters a horrifying half-human, half-fish creature lurking deep below the surface.
