Eclipse of the Jaguar — Richard Trout

Ancient Mayan history and legend lead the MacGregors through the dense jungles of Central America in pursuit of a madman -- from the author of Devil's Breath.
 
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Deep in the heart of the rainforest of Belize, the MacGregor family becomes embroiled in an international caper involving Mayan treasure, villainous looters, secret ruins, and human sacrifice.
 
In an effort to locate the hidden tomb of a Mayan king, the psychopathic Mr. Frost leads a team of thieves in stealing all of the ancient Mayan codices from museums around the globe. When Frost kidnaps two of the children, it's up to the teenage heroes to solve the mystery of the Mayans before it's too late. Flush with action and suspense, this fast-paced Central American adventure brings the MacGregor family closer than ever to confronting their mortality.
 
The award-winning MacGregor Family Adventure Series has received praise from such outlets as School Library Journal, VOYA, and bestselling author Clive Cussler. Each book in the series features a deep knowledge of cultural, historical, and environmental issues as well as foreign landscapes, technology, and sociopolitical issues.