Under the docks floats a dead shark with the figure of a man inside . . . He comes from one of the worst pirate prisons in the South Seas. He has his eye set on a map left in an antique shop that he hopes will help him in avoiding the authorities. This is all before he plunges into gunfights, shipwrecks, and trickery in his search for an ancient treasure. But when his map leads to an island at the center of the ocean, surrounded by ships and planes, Geronimo Jim has only one way to get to the treasure — skydiving with nothing but a pair of pistols and his own quick wit.