Sicarivs: The Night and the Silence (2015)

A hit man is asked to kill a woman. Another job. However, when it is about to run, he does not. Thereafter begins a race against time to stop those who would have been hired because he knows that in his profession, who does the work, is dead. One after another, is killing their victims. Coldly, ruthlessly. Only at the end, in the last moment of the film, we know why he did not kill the woman.