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For over forty hours, the teenagers Toby, Roland and Mark drift helplessly and completely exhausted on a life raft in the vast sea. As if steered by a ghostly hand, the inflatable liferaft lands on a lonely island. A fresh water lake and some fruits save the boys from starvation. As the three stranded boys explore the tropical island, they come across a disfigured corpse in a ski suit. With cunning and tactics, but also with harpoon, knife, and pistol, the boys decide to get to the bottom of this horrible find...