Sherlock Holmes and the Case of the Dead Duke
A pregenerated scenario book using the minimalist Engle Matrix Game system. This includes several murder mystery scenarios where the players are Sherlock Holmes and associates. The system has explicit negotiation of arguments and results¸ but leaves the chances for the negotiated outcomes entirely up to the GM. - A description from https://darkshire.net/jhkim/rpg/encyclopedia/ with kind permission of John H. Kim