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An old pirate map leads George and his friends to a mysterious network of trap-laden tunnels beneath New York City.

George van Gelder and his friends, having found Captain Kidd's secret journal, now know for sure there is a priceless gem buried deep beneath New York City, but they soon discover the treasure is not going to give itself up easily.

After weeks of searching the New York City catacombs for a centuries-old diamond buried by a pirate, George van Gelder and friends are stopped in their tracks when their underground enemy, Leroy, kidnaps George's father's new girlfriend and holds her for ransom in order to gain the treasure.

A New York City boy sets off in the elaborate tunnel system connected to his basement to find a diamond left there by a pirate three hundred years ago--and finds that dangerous foes are also searching for treasure.