"The House of Doctor Chamberlain is a self-contained horror-themed adventure using the simple Risus system (explained within), perfect for an evening of fun with friends. The player-characters are invited to a manor house, where they witness a murder. As they explore the house in investigation, they turn up ghosts and the tone turns increasingly macabre, leading up to a frightening confrontation."
The PDF is available here. Try it out this week and let us know how it goes!