Maskerade: A Novel of Discworld

The story begins with Agnes Nitt leaving Lancre to seek a career at the Opera House in Ankh-Morpork. When Granny Weatherwax realizes Nanny Ogg has written an immensely popular cookbook but has not been paid by the publisher, the witches also leave for Ankh-Morpork to collect the money, as well as to attempt to recruit Agnes into their coven, to replace Magrat Garlick who left the coven when she became Queen of Lancre (in Lords and Ladies). This has the side benefit of distracting Granny from becoming obsessive and self-centered, or so Nanny believes to her great relief. Agnes Nitt is chosen as a member of the chorus, where she meets Christine, a more popular but less talented girl. The Opera House Ghost, who has long haunted the opera house without much incident, begins to commit seemingly random murders staged as "accidents", and also requests that Christine be given lead roles in several upcoming productions.