Prologue.
It has been three years since you had seen your brother Clint. Three years since the attack, since you were forced to go into hiding to avoid being killed. Three years of living by a fake name, constantly on the run. Three years of isolation from the one person you had left.
Now that the people hunting you were either all captured or dead, your exile was finally over. Now you were officially working for shield. You were an agent. Your first assignment was with the Avengers at Stark Tower, with Clint.