Within this riveting follow-up to The Bloodstream Gospel, the first publication in the thrilling and atmospheric Order of the Sanguine series, NY Times bestselling authors James Rollins and Rebecca Cantrell deliver a tale of international adventure, intrigue, suspense, and supernatural mystery involving a modern scientist, a highly secret eternal spiritual order, and a terrifying power who must get together to lower a ruthless and cunning enemy and stop the Apocalypse.

While exploring a tomb hidden about Innocent Blood: The Order of the Sanguines Series for centuries in the depths of Masada, Israel, brilliant archaeologist Erin Granger began an unbelievable journey to recover a miraculous ancient artifact linked with Christ himself. The quest launched her to a diabolical enemy determined to find the publication and make use of its forces for his very own dark ends. In addition, it led her to an ancient and highly magic formula Vatican order-known just as the Saguines. Though she survived, the danger has only begun .

An attack outside Stanford University thrusts Erin back into the fold from the Sanguines. As the threat of Armageddon looms, she must unite with an ancient evil to prevent the plans of a man determined to see the globe end, a man known only as Iscariot.