Steve and Colm divert from their usual trek through the Discworld books to speak with Marc Burrows about his forthcoming book, The Magic of Terry Pratchett. Marc has written the first full biography of the great man and it's jammed with insights, anecdotes and truly fantastic footnotes.

You can follow Marc on Twitter @20thcenturymarc & find the book at his website, askmeaboutterrypratchett.com. The Magic of Terry Pratchett will be released on July 30th.