Jack Truck and his best friend Dump Truck Dan are spending the day doing their favorite thing...smashing and crashing throughout the whole town, meeting up with friends along the way But when a mysterious shadow falls and a strange voice calls, is the duo in trouble? Find out in this favorite that launched the Trucktown series as a New York Times bestseller Melvin the worrying Cement Mixer worries about EVERYTHING...and doesn't think he can do ANYTHING He watches nervously as Jack, Pete, and Rita roar, soar, and splash their way to cross a ravine. But when Rita cries out for help, Melvin knows he must do something. Can he stop worrying enough to save her?