There are over 370 books in the Warhammer 40k series. As veteran Warhammer author Graham McNeill explains, the books offer a chance to introduce complexity and depth, while respecting the Lore the fans know and love. There are no greater fans of the 40k world, says McNeill, than the writers themselves. He introduces his top five choices, and gives us a glimpse of the writers’ world - of group workshops, complicated timelines, constant correspondence, and friends for life.