A troop of scouts arrives at a mountain camp for summer activities but soon encounters unusual events: a locked door, mysterious night sounds and a flute song that lead them to explore nearby woods and caves. As they investigate, they uncover a hidden treasure box, a missing key, and a clandestine hide-out involving strangers and treachery. Tensions rise with smoke in the woods, midnight disturbances, and a perilous descent into a cave that requires outside help from a sympathetic captain and a trucker. The adventure concludes with the danger resolved and the troop receiving recognition at a final court of honor.