Talk about it. I have a guess as to who the spy is... Spoiler not really earth shattering but I'll put spoiler tags here anyway. It has to be Enid. Not just because her name is dine backwards but she seems to be the one that leaves secretly on her own. Meeting up or dropping pictures of the inside of the facility. JSS... Just Survive Somehow. building 101... where she ultimately ended up with Carl and it wasn't attacked by the wolves. Not sure if she put the A outside or not. Who else could it be?