AllMovie

After a hitman assassinates someone involved in financial dirty-dealings, he goes back to the boss who had ordered the killing, and is asked to murder another man "who knows too much." And so the hitman proceeds to spy on his target through a window - and observes him in a sexual relationship with the widow of the man he had just killed. Eventually, he has everything set up for the assassination and when he bursts into the man's apartment, he suddenly finds something totally unexpected that changes everything he had thought up to that moment.