The Jungle Pyramid : A missing consignment of gold leads the Hardy Boys on a tortuous and dangerous chase to Zurich, and on to Mexico City. But the real danger lies in the heart of the Mexican rainforest-in the jungle pyramid… The Firebird Rocket : The development of a top secret space rocket is jeopardized when one of the NASA scientists working on the project disappears. The Hardy Boys investigate and the case leads them to Australia, and into great danger...