Four orphaned children, afraid to go live with their grandfather, set up housekeeping in an abandoned boxcar and are doing fine until one of them becomes ill.
While visiting a friend of their grandfather's on Sullivan's Island, off the coast of South Carolina near Charleston, the Boxcar Children encounter mysterious activities related to rumors of a buried pirate treasure.
A friendly writer with a metal detector, the mysterious inhabitants of a tower house, and the discovery of a locket in the sand are ingredients for the Aldens' latest mystery.
