An interesting topic one of my players brought up: How to go about if someone wants to play a traitor?
I didn't manage to make it work in a good way, not without the risk of hurting the other players. So I'm gonna do some experimentation and see how it turns out: I'm gonna drop a warning in their lap and see them suspect each other. Their superior is gonna say "We have reason to believe there's a traitor among us. Just keep your eyes open". And at a later point in the campain an NPC is going to betray the group.
Do you think it is possible to incorporate any traitor-elements in the game? Have you let any of your players perform any acts of betrayal against the rest of the group?