The Jungle Pyramid, The Hardy Boys Mystery Stories #56 in the series. Author: Franklin W. Dixon. 180 printed pages pages. Hardcover book. Publisher: Grosset & Dunlap, copyright 1977, printed 1977 in the U.S.A.

Synopsis:  A nationwide string of daring gold robberies has left the authorities baffled, and Frank and Joe Hardy are called in to help after a huge gold shipment disappears from a bank vault without a trace. Their investigation leads them from the quiet streets of Bayport to the heat and mystery of Mexico, where clues point toward an enigmatic criminal organization obsessed with ancient treasures.

Following a trail of coded messages, booby-trapped ruins, and a shadowy mastermind known only as “the Jaguar,” the Hardys discover that the stolen gold may be tied to a lost Aztec treasure hidden deep in the jungle. Alongside their father, Fenton Hardy, the boys trek through rugged terrain, battle dangerous wildlife, uncover secret passages in an ancient pyramid, and face repeated attempts on their lives from the criminals trying to guard their operation...

Condition: The book is in excellent condition .  The covers and inside pages are in excellent with no writing or creased pages, and the binding and spine are in excellent condition (see photos).