Retired Army Ranger turned historian John Holliday has thwarted the plots of Rex Deus, the twenty-first-century incarnation of the Templars, all over the world. Now, the lost journal of explorer Percy Fawcett leads Holliday deep into the South American jungles on a quest to uncover the greatest mystery of the Middle Ages ... Trailed by an infamous tomb raider and menaced by a tribe of hostile natives, Holliday and his crew uncover a five-hundred-year-old society hidden in the cauldron of the Amazon. Descendants of the Templar Knights, they exist for one reason: to hide and protect the holy artefact taken from the original Temple of Jerusalem by the first Templars: the legendary Ark of the Covenant. Will Holliday's obsession with the truth finally kill him?