A group of boys accepts an invitation to spend a summer on a Western ranch, where they learn cowboy ways and pursue a mysterious lead discovered by one of them. Their stay involves horseback travel, tracking clues to a riverside cave, thrilling chases, encounters with a menacing figure, and survival through a severe storm before the circle rejoins in celebration. The episodes combine outdoor action, practical problem solving, and steady camaraderie, underscoring themes of friendship, courage, and the excitement of exploration.