This movie is based on a notorious rape-murder case which happened in 1964. Kitty Genovese was stabbed and raped in New York. Two weeks later the "New York Times" published an article titled "Thirty-Eight Who Saw Murder Didn't Call the Police." Following lengthy investigation, it appears that the headline was incorrect, as nobody witness the whole brutal attack from beginning to the end, because it took place in the course of half hour and in different locations.

However, the case sent social psychologists wild, in search for explanations. The conclusion was that contrary to common expectations, larger numbers of bystanders decrease the likelihood that someone will step forward and help a victim.

Anyway, I suppose that the movie was set in Le Havre to keep the "city by the sea" background, even if in another continent. But I find it sloppy and disrespectful towards the audience to have used as a plot device horrible murder, which is a classic feature of social psychology textbooks.