well if anyone is a halflife 2 fan like me theyed like this map   
ttt_city17ruins   
http://www.garrysmod.org/downloads/?a=view&id=95692   
its basically the map where you fight the striders as your making your way to the citadel, you know where barney yells "And if you see Dr. Breen, tell him I said FUCK YOU!"   
And the other map is    
clue    
http://www.garrysmod.org/downloads/?a=view&id=98036   
its based of the hit movie that I know all of you have seen, when i tested this map all i could think of were all the ways i could kill someone as traitor. I'm thinking it was hellspawn with the knife in the kitchen.