The Secret of Skull Mountain (Hardy Boys Mystery Stories, Book 27)

vi, 212 pp. Light brown tweed boards, dark brown titles, orange Gretta endpapers, frontispiece by Russell H. Tandy. 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.