Robert Garvin—believing the print belongs to Chac Xib Chaac, the creature that wiped out the Izamal expedition—launches a new archaeological campaign with the covert objective of capturing the monster.

Ignoring the true purpose of the mission, Professor Mike Trenton joins biologist Dr. Barbara Heller and herpetologist Paul Kruty as mission experts. But what begins as a routine day at the excavation site soon descends into a harrowing fight for survival.