Inside Hastur's Studio (Cthulhu)

You are part of an independent detective agency in late-20s New York City. Your boss, one August Derleth, came into the business looking to help bored housewives find their cheating husbands... but, inevitably, you've been drawn into the endless conflict for supremacy between the Law and the Mafia. Just last week, you got a tip about an evidence cache - notes and records linking the Mafia families to some horrible crimes. The evidence, collected by an agent anonymous, rests within the props for a new play in town, the King in Yellow. The government reward for turning this into the right agencies will be a small fortune. All you have to do is get to the evidence first...

Inside Hastur's Studio is a one-shot game for four to six players, using the d20 Cthulhu system.