In the aftermath of Civil War, Captain America is taken into S.H.I.E.L.D. custody where he is assassinated per the order of the Red Skull. Crossbones snipes at him while Sharon Carter, who has been brainwash ed by Doctor Faustus posing as a S.H.I.E.L.D. psychiatrist, delivers the killing blow. S.H.I.E.L.D. director Tony Stark and Black Widow hunt Captain America's murderers. Falcon, Captain America's old partner, follows his own leads to find the killers. Meanwhile, Bucky Barnes decides to kill Tony Stark, blaming him for Captain America's death.