I Shall Wear Midnight is a comic fantasy novel by English writer Terry Pratchett, set on the Discworld.
When they find Roland and Letitia the Nac Mac Feegles, who have as usual been following Tiffany, are accused of destroying a pub.
Tiffany and Mrs. Proust are arrested by Carrot and Angua, and (nominally) locked up – although it is mostly, in fact, for their protection as people start to resent witches.
When they are released the next day, Tiffany meets Eskarina Smith (not seen since the events of the third Discworld novel, Equal Rites), who explains to her that the Cunning Man was, a thousand years ago, an Omnian witch-finder, who had fallen in love with a witch.
She stops them, and goes to see Roland, who throws her in a dungeon (which she locks on the inside, and where she is brought bacon, eggs, and coffee in the morning).