Colonial days and pirates for stage setting of a hearty plot with a happy ending, a book of early America, with authentic flavor of everyday living. The Crathornes turned their home into an inn when word came that the father's ship had been captured by Black Sebastian. Four children of varied ages and sexes, Jeri, the cabin boy who had escaped the pirates' ship, foul play in the neighborhood of the home caves among the cliffs, combine for a fast-paced yarn.