Anna, Jose, and Henry are junior members of the secret Silver Jaguar Society and swear to protect important artifacts from around the world.  In this fast-paced adventure set in Costa Rica, a gold Jaguar Cup has been stolen and replaced with a copy.  All members of the Society try to discover the thief and regain the cup.  They travel to Costa Rica and meet Sophia and her family who own the lodge where they will be staying.  Their parents then fly to San Jose to check out the gold museum, where the cup went missing.  Sophia becomes their guide and fellow investigator.  The focus shifts from one suspect to another as the teens track down clues.  Messner’s description of the rainforest and its animals bring the reader right into the scene – sweating in the sultry humidity, stumbling upon biting ants, avoiding poisonous snakes, spotting incredible, yet camouflaged animals within the wilds, as well as running out of breath and energy during riveting chase scenes near the end.  An author’s note in the back includes photos of some of the animals and scenery mentioned in the book.  This is book two in the series, although they do not need to be read in order.  Great series for those who enjoy action adventures and mysteries.