Nina Blanton has been downsized out of her job as a university librarian. She's of Mexican heritage but had never been back to the land of her birth. Then she wins the "Romantic, Mysterious Mexico" contest sponsored by a new South Florida-based magazine for seniors, "Prime Seasons." Grand Prize is an 8-day, all-expense-paid guided package tour to the Caribbean resort city of Cancun, Mexico, and nearby Mayan ruins. Upon arrival, Nina learns that the tour operator went bankrupt and her pre-paid vouchers are now worthless. She can't pay for her suite at a luxury oceanfront resort so she's forced to spend the night in a cheap budget hotel, where she's robbed by armed thugs. Nina threatens to sue Prime and the magazine assigns its new travel editor, Bret Farr, to fly to Cancun to act as substitute guide for Nina. Bret is ordered to change Nina's mind about filing the lawsuit. If he fails, he will be fired. But Nina is neither a fool nor a pushover, as Bret soon learns, and death threatens as the two strangers explore the blood-stained ruins of an ancient civilization.