The mystery of Cabin Island - Franklin W. Dixon (The Hardy Boys #8)

The Hardy boys are elated over their good luck when wealthy Elroy Jefferson invites them to spend Christmas vacation at his private retreat on Cabin Island. But when Frank and Joe make a reconnaissance trip in their ice-yacht the Seagull to the island, a belligerent stranger orders them off. Why?

Before twenty-four hours have passed, the Hardys find themselves involved in two mysteries: the first concerns the recent disappearance of Mr. Jefferson’s grandson, Johnny; the second, the baffling theft of a priceless collection of antique medals which took place two years before. The young detectives, with their pals Chet Morton and Biff Hooper, pursue both cases on the icebound, snow-covered island.

Sabotage to the Seagull, danger to themselves, and a ghostly prowler do not daunt Frank and Joe in their search for Johnny Jefferson and for clues to the stolen antique medals. How the teenage investigators outwit a ruthless foe and succeed in solving both mysteries makes for mounting suspense in this fast-moving adventure.