The Bible ends with a book of extreme visions that two millennia of history have done little to explain. Now Nick Page travels to the key sites from the original book, and journeys metaphorically through the history of apocalyptic literature, unpicking the weird and wonderful truths - and wild fabrications - that have driven the creation of multitudinous sects down the centuries. Culminating in a month on Patmos itself, the key question is: will Page discover the secret truth of the apocalypse, or be driven mad by his need for Marmite?