Monster-obsessed best friends Nick, Carter, and Angelo have defeated the Zombie King, taken down a mad scientist, and even squared off with their own evil twins. But the trio is in for their spookiest mystery yet when Nick's family wins a trip to Mexico to join an archaeological dig on some forgotten Mayan pyramids. When the boys arrive, they learn of a previous expedition that vanished into these very pyramids fifty years ago. Angelo is convinced that aliens must have been involved, but Nick starts to suspect that the disappearance had more to do with an ancient Mayan curse - one that may still hang over the ruins today. Using their knowledge of real Mayan mythology, the three friends must unravel the secret history of the curse - before someone very close to Nick ends up trapped in the underworld forever.
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