The Amateur

When his fiancée is murdered by terrorists, a Central Intelligence Agency (CIA) cryptographer named Charles Heller blackmails his superiors into sending him on a field assignment into Czechoslovakia to assassinate those responsible. Just as he enters the field, the CIA locates the stolen material he had been using to blackmail the agency, eliminating their need to cooperate with him. So he is behind the Iron Curtain, inadequately trained, and without support.