Bats in Dabelfry!

From the Publisher's Website:

Roll up your sleeves and sharpen your fangs, it's time to explore the spooky old attics of Dabelfry Manor! Whatever you find is yours to keep, if it doesn't eat you first...

From the Introduction:

This is a short, fun and gruesome adventure in poor taste, for a handful of low-level characters. It's written for Tunnels & Trolls version 7.5, but nothing prevents the use of earlier editions of the rules. It will probably be completed in a single session and requires no special preparation beyond familiarising oneself with the text. Illustrations are provided in the Appendix so that they can be easily presented to the players.