Another youth, adventure story from the prolific Ralph Henry Barbour In this offering, 16-year-old John ("Jack") Herrick is the skipper of the "Crystal Spring," a sailboat, with which he runs a water service, after the recent death of his father. He and his chums have a number of adventures, including a gale-force storm, a sunken wreck, being marooned, and treasure, in typical Barbour style.