I Shall Wear Midnight is a novel in Terry Pratchett's Discworld series, and the fourth in the Tiffany Aching arc. It centres on Tiffany Aching, who is now fifteen years old and getting on with the hard work of being a witch. The title is a quotation in A Hat Full of Sky: 'When I'm old I shall wear midnight, she'd decided. But for now she'd had enough of...