Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch (Discworld)

According to The Nice and Accurate Prophecies of Agnes Nutter, Witch (the world's ONLY completely accurate book of prophecies, written in 1655), the world will end. Next Saturday, just before dinner... The armies of Good and Evil are amassing, and everything appears to be going according to The Divine Plan. [Re]-enter a somewhat fussy angel (Aziraphale) and a fast-living demon (Crowley). Both have lived amongst Earth's mortals since The Beginning and have grown rather fond of the lifestyle. The unlikely duo team up to stop the coming apocalypse, chasing down the Antichrist. Who was misplaced as a baby 11 years prior-- the ultimate test of nature versus nurture.