The Osterman Weekend

CIA director Maxwell Danforth (Burt Lancaster) watches a recording of agent Laurence Fassett (John Hurt) and his wife (Merete Van Kamp) having sex. When Fassett goes into the bathroom to take a shower, two assassins enter the bedroom and kill his wife. Fassett, unaware of his employer's involvement, is consumed by grief and rage. He hunts the assassins, eventually uncovering a Soviet spy network known as Omega.