V. Lyorn by Steven Brust
The seventeenth book in Steven Brust's long-running Vlad Taltos series. For complicated reasons, Vlad has to hide out in a theater. Why a theater? They are shielded from sorcery, as proof against magical spying by rival theater companies, and Vlad is on the run from the Left Hand of the Jhereg – the crime syndicate's all-woman sorceress squad – and so he has to hide in the theater.
13/