Instant New York Times Bestseller Masterful...The Fifth Gospel is that rare story erudite and a page-turner, literary but compulsively readable. It will change the way you look at organized religion, humanity, and perhaps yourself. —David Baldacci A gripping thriller rich with human drama and forbidden knowledge. —Lev Grossman A lost gospel, a contentious relic, and a dying popes final wish converge to send two brothers—both Vatican priests—on an intellectual quest to untangle Christianitys greatest historical mystery. Ten years ago, Ian Caldwell and Dustin Thomasons The Rule of Four became a literary phenomenon that sold nearly two million copies in North America and was hailed by critics as ingeniousprofoundly erudite The New York Times, compulsively readable People, and an exceptional piece of scholarship San Francisco Chronicle.