The Hardy Boys' Mysteries #27: The Secret of Skull Mountain
- ISBN: 0448089270, 9780448089270
- Published: 1948
- Format: Hardcover
- Publisher: Penguin Random House
There is a crisis in Bayport! Soon the city will be without water! Every night, water strangely disappears from the new reservoir near Skull Mountain. Frank and Joe Hardy join forces with a team of skilled engineers to solve the baffling mystery.
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