For George's birthday, her parents bought her, Nancy, and Bess a 4-day bike tour around the beautiful Mystic Lake. Everything starts off okay, but then strange things begin to happen: their tent is stolen, food goes missing, their tires are slashed. . . It's almost as if someone doesn't want them to enjoy or even finish the tour. Is it just a bunch of bad pranks or is someone seriously trying to sabotage this trip? It's up to super sleuth Nancy Drew and her 2 best friends to solve this mystery!
