From publisher blurb:
The Haunted Theatre is a low-level dungeon created for Knave and other old-school RPG systems. Full of traps and creepy monsters, it's a perfect spooky adventure for a late-night game session. If you don't have time to prepare, roll to fill each room as you play, or if you've got time, create your perfect scare-fest ahead of time to give your players a full horror-movie experience.
The dungeon comes with a full map of the theatre, as well as plenty of random tables to use to create a spooky atmosphere.