Mafia 20. Radioactive Dreams.

By the way, here's a theory, although it's still a bit rough. It suggests that the thirteenth player is Deriel_Linch, because he has brushes in his signature. But there's one inconsistency here. The fact is that he last appeared on the 25th, and therefore either wasn't active or was sending messages via ICQ.

There are no other ideas yet, although this one is also doubtful.