Vivian (Jan Sterling), a B-girl working at 'The Grass Skirt', is being brushed off by her rich, married boyfriend. To confront him, she hijacks drunken customer Henry Shanway (Marshall Thompson) and his car from Boston to Cape Cod, where she strands Henry...and is never seen again. Months later, a skeleton is found (sans clothes or clues) on a lonely Cape Cod beach. Using the macabre expertise of Harvard forensic specialist Dr. McAdoo (Bruce Bennett), Lt. Pete Morales (Ricardo Montalban) must work back from bones to the victim's identity, history, and killer. Will he succeed in time to save an innocent suspect?