Tyler and Mac wrap up their summer with time away from home at Camp Tonkawa, along with their friends Alex and Monica. What should have been a fun, relaxing time kayaking and hiking suddenly turns dangerous when Mac's kayak is sabotaged and sinks in a camp race. But the danger doesn't stop there! Who's behind it all and why? Find out if the four friends can get to the bottom of things before someone gets hurt really badly . . . or worse!