While on vacation in a resort in Mexico, the Americans Jeff, his girlfriend Amy, her best friend Stacy and her boyfriend Eric befriend the German Mathias in the swimming pool. Mathias invites the group to visit the ruins of a Mayan temple with his Greek friend Dimitri in an archeological field where his brother Henrich and his girlfriend are camped eighteen kilometers far from the resort. They hire an old taxi and when they reach the spot, they are surrounded by Mayan villagers armed of revolver, rifle and bow-and-arrow that kill Dimitri and do not allow the group to leave the place. They climb a construction covered of creepers with red flowers, and remain under siege of the locals. When they hear a cell phone in the bottom of a well, Mathias decides to seek the apparatus using a rope that breaks and he has a serious accident breaking his back. Amy and Stacy go to the bottom of the mine to rescue Mathias and they find many corpses covered by the climbing plants; further...