A group of inner city youths stops at the lodge while on their way to Whitefish Falls. Ricco, a troubled loner of a boy, takes an outboard from the lodge and runs the tank empty. He swims to shore and happens to land where Billy and Pete are camping. Ricco steals Billy's equipment and hides in an abandoned mine. When Billy confronts Ricco a struggle ensues and the two are trapped inside the mine when a beam gives way. The youth leader and Officer Nixon undertake to rescue the two boys.