Amanda Bell, author of The Lost Book, and Jason McElligott, library keeper of Marsh’s Library, Dublin. They are looking at the Galeni Librorum, a rare book that went missing from the library, which is at the heart of Bell’s story. Photograph: Alan Betson

Once upon a time, a man wandered into a junk shop and found a dusty, battered book with a strange diamond pattern on the front. Inside, the pages were(...)