Horse Thief Cave is a story about discoveries made by a group of boys as they explore the bluffs around their area. On their way to discovery, they find signs of thieves from long ago and evidence of American Indians. Fear of a fire, fear of vampire bats, fear of getting stuck in a cave, and fear for a mother's life are worries Ben and some of his friends face as they explore. A few experiences include involvement with girls as friends and a few others with girlfriends. Being put in jail and running into a bear while on the trail are unpleasant experiences for Ben and his family. Naked, skinny-dipping boys and fish worms add excitement for the girls. Scout camp brings several experience and challenges.