Welcome to the guild. That role-play idea sounds like it could be cool, since that era usually works as a decent setting for stories and detective plotlines are always a good genre to go for. I write some murder mystery work myself, so I definitely know how effective it can be. I'm even the host of a game on this site that's centred around the concept of working who out of a group of people is the murderer, mostly through psychological warfare and deductive skills. Anyway, all the best.