In Cancún, Mexico, for a peaceful vacation, a group of tourists sets off in search of one of their group who disappeared during an excursion to some nearby Mayan ruins, only to come face to face with an insidious evil that threatens their lives.

Two weeks before the end of the world predicted by the ancient, Maya calendar, Dr. Gabriel Stanton receives a call from a hospital resident alerting him to the presence of a patient whose every symptom confounds and terrifies him. Meanwhile, Chel Manu, a Guatemalan American researcher at the Getty Museum, finds herself in possession of an illegal ancient artifact: a priceless codex from a lost city of her ancestors. This record seems to hold the...