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 for their father, Fenton Hardy, had been for years on the detective staff of the New York police. Of late years he had been living in Bayport conducting a private detective service of his own with great success. He was known from one end of the country to the other as an exceptionally brilliant investigator.

Frank and Joe Hardy, his sons, were ambitious to follow in their father's footsteps, although their mother wished them to prepare themselves for medicine and the law respectively. But the lure of Fenton Hardy's calling was persistent, and the two boys were bent on proving to their parents that they were capable of becoming first-class detectives.

They had given proof of this already by helping their father in a small way on a number of cases, but their first big success had been achieved when they solved the mystery of a jewel and bond robbery from Tower Mansion in Bayport. The story of this has been related in the first and preceding volume of this series, "The Hardy Boys: The Tower Treasure," wherein was recounted how the Hardy boys solved the mystery of the robbery when the Bayport police and even Fenton Hardy himself were baffled.

"I'd rather tackle a good mystery than eat," laughed Frank. "And here is one right to hand. Let's go back."