A lost gospel, a contentious relic, and a dying pope's final wish converge to send two brothers--both Vatican priests--on an intellectual quest to untangle Christianity's greatest historical mystery.

The discovery of a document written by James of Jerusalem, the younger brother of Jesus Christ, sets off reverberations throughout the world. "In the ruins of the ancient Roman seaport of Ostia Antica, an Italian archaeologist has discovered a first-century papyrus, its faded text revealing a new gospel written by James, younger brother of Jesus. This discovery will show the world a new Jesus Christ, fill in the missing years of his ministry, contradict...