Nick Wilson is running away - at least for one night - and he is determined to take his best friend Tyler with him. Ty and Nick just finished building an authentic log raft complete with a sleeping cabin. Now they are ready for adventure on the beautiful Mason River that runs though their small town. The boys planned this river trip for months, and now it's looking like they might not get to go unless they take matters into their own hands. The Mason River is wide and gentle where it passes through town, but neither boy knows for certain what dangers might lay ahead. They are soon to find out, and their fathers might learn a few things in the process, too.