In this fifteenth book about the irrepressible Sammy Keyes, she deals with the zaniest character to come out of her town yet—Justice Jack, Santa Martina's very own superhero. Dressed in spandex and a mask, he drives around on a dirt bike hoping to fight crime. Though everyone else seems taken with Jack, Sammy's not so sure and now that she has a real mystery to solve her detective skills are pushed to the limits by Jack's antics. As usual, Sammy's personal drama adds to the excitement in this wacky and wily adventure.