By the Power of Grayskull! Walt and Annie make their first foray into Terry Pratchett's Discworld books, and team child-witch Tiffany Aching up with hard-nosed, by-the-book Sergeant Nicholas Angel. Will these two partners learn to work as a team on behalf of the Greater Good (the Greater Good), or will they need to turn in their guns, badges and frying pans? You'll have to listen to find out, but remember: we are absolutely 100% humans.