Captain Leyton treats his son, Boy, harshly to eliminate every weakness, but he is so overjoyed at Boy's courageous defense of the character of his sweetheart, Minnie, that he has a heart attack. Before he dies, Leyton charges Boy with avenging his mother's desertion of his father for another man. Boy finds his mother; discovers the other man to be Leyton's first mate, Morgan; hurls Morgan overboard; and returns to marry Minnie.