They have been living among us for millenia, hiding in the shadows. Some believe in them, some do not, but when the mythical become a threat, the U.S. military sends in their own supersoldiers to defend against the supernatural.The shapeshifting giant Tezcahtlip is free in the modern world, eating the hearts of victims to steal their form, their memories and their power.After losing his brother in a battle with the American military, the giant flees to Mexico, taking up residence in the Yucatan where he poses as the Mayan god Kukulcan in an effort to gather followers and sacrifices.The men and women of Detachment 1039 will need help from an unlikely source before they head south to combat the monster. Can a vampire imprisoned at Alcatraz really be a help, or a hindrance?