From the ancient mysteries of a Mayan temple to the sinister secrets of modern medicine, FBI agent Caitlyn Tierney uncovers crimes that have been buried far too long and far too deep...

It’s the kind of case that chills Caitlyn to the bone. Missing person. College student. Beloved daughter of a world leader in biotechnology. She was last seen on a spring break cruise. No witnesses. No motives. Just one possible lead— reports of a stranger who may have lured the young archeology major off the ship and into the jungles of Guatemala. When Caitlyn follows her hunch into the jungle— with the FBI’s Jake Carver by her side—the trail takes a surprising turn into the very heart of darkness.