Mayre Griffiths, nicknamed Trot, or sometimes Tiny Trot, is a little girl who lives on the coast of southern California. Her father is the captain of a sailing schooner, and her constant companion is Cap'n Bill Weedles, a retired sailor with a wooden leg. (Cap'n Bill had been Trot's father's skipper, and Charlie Griffiths had been his mate, before the accident that took the older man's leg.) Trot and Cap'n Bill spend many of their days roaming the beaches near home.