This week's Book Club podcast guest is Charles Spencer, whose book The White Ship: Conquest, Anarchy and the Wrecking of Henry I's Dream is new out in paperback. On the pod tells Sam Leith why his story is like "Game of Thrones meets Titanic", about the piety and the startling cruelty of medieval kings, the tantalising suggestion that the wreck of the White Ship may have been found off Barfleur -- and how this 12th-century maritime disaster changed the course of English history.