So runs the usual response to a movie adaptation – stuff gets cut, favourite scenes left out, it’s just not how you imagined it. So it’s unusual to be given a script and asked to turn it into a novel.

As we nurse a queezy stomach from playing EA DICE's Parkour-inspired Mirror's Edge, we'll be doing so to a story penned by writer and story designer Rhianna Pratchett, who's known for her work on ...