in the playhouse you can be an actress in the play, and are required to in order to complete the quest. There are two different ways to complete it depending on which answers you give during your performance. One way is to use the 'Script' exactly the way it was written, the other option is to find the secret room in the cellar and use the 'Blutspot'(not sure if I spelled that right) version that you get from the secret room.
