[quote=Dervish]
Or a battle royale with all the versions of Sherlock sluthing each other to the death.Elementary, really. There can only be one.
[/quote]

One of them commits a murder but they don't know which one. They have to find and put them to death for their deeds, but if they find the wrong one an innocent person is sent to death and the second murder happens. Spoilers: Our resident Mod is the one who did it.