Looking for yet another story that I have lost track of. In this one, Charlie is taken by an American militia group, I believe.
I remember the beginning. They attempt to take him first while he's at home, eating with Don and Alan. The kidnapper is disturbingly polite and has Charlie tie them up, before trying to take him. Megan and Larry stop by, however, and interrupt. The whole team gathers and stays the night at the house. I remember Don sleeping in Charlie's bed with him for protection (it isn't Eppescest though).
Don't remember much of the rest of the fic, but Charlie is put in a safe house, and the group attacks and captures him, killing an agent in front of Charlie in the process, and take him to a boat to travel north. I believe they wanted him to create an equation that would somehow enable them to target a middle-eastern country, but Charlie is obviously very resistant. They may or may not attempt to coerce him with some torture-light techniques.
I think the ending had them somewhere in the north-west, with Ian Edgerton making an appearance. The group tries to hide Charlie by restraining him and putting him in a small box that is concealed as a seat in their van (once again, I think
). Megan is the one who finds the rather traumatized professor.
And that's about all I remember. Thanks in advance.
ETA: Found - Your Brother's Keeper