Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch by Terry Pratchett and Neil Gaiman began life almost forty years ago as an idea that grew legs (and scales and rapidly wings) and went on to be published in 1990. The story follows the angel Aziraphale and the demon Crowley as they attempt to avoid the impending Apocalypse on the horizon. There's also the small matter of a missing Antichrist…