Avenger FF (The Lost Ones)

The Avengers have received an interesting assignment from Shields - they are supposed to track down a girl in Germany.
A plain normal girl. Although the assignment seems almost ridiculous, the Avengers are following the assignment and have received an important tip from Fury. Under no circumstances should the girl be injured. At the same time, Tony finds out that Shields are working on some kind of human secret weapon. Fearful of a new, vicious super soldier, he secretly addresses it among the Avengers. What does this girl have to do with the whole thing and why does Thor seem so distraught when he saw the mortal?

The pictures aren't mine!!