The Hardy Boys, brothers Frank and Joe Hardy, are fictional characters who appear in several mystery series for children and teens. The series revolves around teenagers who are amateur sleuths, solving cases that stumped their adult counterparts.
The Secret of Skull Moutain is Volume 27 in the original The Hardy Boys Mystery Stories.
The story begins when Joe wants to go swimming; however, Frank points out that there is not enough water because of a low reservoir. When they discover that the water at the Skull Mountain facility disappears each night, they team up with Chet Morton and engineers Dick Ames and Bob Carpenter to solve the mystery.
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