In an epilogue to his new book Assassins and Templars, Steve Tibble says (or, perhaps, protests) that his book really has nothing to do with the video game “Assassin’s Creed”, that any similarity is not so much coincidence as common intellectual and cultural ancestry. Readers of a certain generation might entertain some skepticism, especially in light of Tibble’s colloquial (albeit steadfastly rigorous) approach to the subject. Tibble might nevertheless have been aware of some pop-culture competition for reader mind-space, for he has written a page-turner of a history.