On the surface, this film, which I like, is like dozens of other revenge-the-death-of-a-cop-partner stories. But the saving grace of the movie is the characters, and some of the dialogue.
Spoilers in the following
Eddie Jilette is a tough cop. A tough Chicago cop. But what distinguishes the film that his Captain is tougher and nastier. In a later scene in the film, the captain and Eddie are in an airport where, in the Men's washroom, after making sure that they're alone, the captain gives Eddie a weapon to kill the villain, and expects him to use it. In most such films, a tough cop usually has a captain who's either a politician or a wimp. How refreshing!
The film also has a nice touch. Eddie rents all the rooms of a hotel in Algiers. The only inhabitants were the clerk and a cat. Eddie tells the clerk to beat it, because he's expecting a showdown battle there. Shortly before the battle commences, we see the cat leave the building.
One I've watched several times and one that's in my library.