Helpful Score: 1
The Hardy boys spend their Christmas vacation at a private retreat on Cabin Island. But when Frank and Joe make a reconnaissance trip in their iceboat the Sea Gull to the island, a beligerent stranger orders them off. Why? Sabotage to the Sea Gull , danger to themselves, and a ghostly prowler do not daunt Frank and Joe in their search for a missing person, and clues to some stolen antique medals.