I Shall Wear Midnight is, as Pratchett notes, an urban fantasy; the fourth in the series of Discworld novels that focus on the young witch Tifany Aching. In I Shall Wear Midnight we join her as she finally becomes accepted into her community as their witch... But has she? Something has been awakened, something powerful and filled with a hate so vicious it overflows and spreads like a disease. Unfortunately, along with it, it has awakened all the old stories of evil, old witches, stories which are catching on fast and as the hate spreads they become aimed at Tiffany herself.