The Jaguar Prophecies is by Phyllis Gunderson. Matt Howard is an archaeology professor. She receives a mysterious invitation to a Mayan festival in Mexico and decides to attend. Once there she is drugged and wakes up to find herself tattooed and unwillingly, and mistakenly, part of a Mayan end-of-time cult. She is supposed to warn "her people" that the end of the world is coming.
Ratings: 8th grade - 4 out of 10 - AC (some mature thematic content).