Tiffany Aching, the young witch from The Wee Free Men, A Hat Full of Sky and Wintersmith is back in a new adventure featuring Discworld characters both familiar to fans (like Granny Weatherwax) and new (meet Wee Mad Arthur, the Nac Mac Feegle on the City Watch). Oh, and there's a shambles, a twist through time, a Cunning Man - and a Giant Man of chalk...