There are few constants in The Untouchables. Leading man Kevin Costner comes in after nemesis Robert De Niro (as Al Capone) opens the movie; only the Chicago setting and Ennio Morricone’s grandiose, bombastic, omnipresent score are unabated. Director De Palma embraces the film’s various phases, sometimes through Stephen H. Burum’s photography, sometimes just through how much he lets the actors chew at the scenery. In his deftest move (with the actors, anyway), the only ones De Palma never lets get chewy are Costner and Sean Connery. With Connery, it’s a wonderful disconnect from what could be a very showy, chewy role. With Costner, it’s more because David Mamet’s screenplay has him so absurdly earnest, the part doesn’t have the teeth for it.

Costner’s the protagonist–and when Untouchables fully embraces itself as an action picture in the last third, it’s Costner leading the charge–but Connery and De Niro get the best parts. Connery’s an aged, failed, albeit mostly honest, beat cop who can’t help but bond with earnest treasury agent Eliot Ness (Costner). Even when De Palma, Burum, and Morricone turn up the melodrama on Connery, he stays reserved. His is the most honest part in Mamet’s script, whether in his counseling of Costner and the rest of the team (Charles Martin Smith and Andy Garcia) or butting heads with cop pal Richard Bradford. De Niro, on the other hand, plays Capone like Robert De Niro playing Al Capone. It’s an exaggerated performance in an exaggerated film, only De Palma doesn’t direct the scenes for De Niro’s performance so much as around it.

The Untouchables is weird that way. It all comes together, but isn’t fluid outside that Morricone score. And Chicago, of course. It makes wonderful use of its locations. The score and setting glue the consecutive pieces of the film together, which is particularly helpful since Mamet repeats himself over and over when it comes to exposition. Most of Smith’s part–outside his introduction, action sequences, and occasional cute moments–is saying the same things, over and over, about getting Capone on his taxes. And he talks about it in his first scene.

Mamet and De Palma are also real bad about Costner’s family life; after introducing Patricia Clarkson and doing a little establishing, she’s pretty much offscreen to the point it’s not even clear she’s pregnant. The pregnancy only becomes a plot detail after she gives. While she’s in the movie throughout–she’s how Mamet and De Palma introduce Costner in fact–she doesn’t have any lines.

Actually, besides Clarkson, there might only be three other speaking roles for female actors. And each of them only get one scene. Untouchables is all about the boys. They all talk about how nice it is to be married. It’s one of Mamet’s main recurring dialogue motifs; De Palma doesn’t seem to put much stock in it though. Costner and company, in their battle for good against De Niro and his goons, are separate from the goings-on of the regular world.

All of the acting is fine, some of it is better. De Palma seems to know he can get away with exaggerated performances because nothing’s going to be louder than that Morricone music. Or main goon Billy Drago’s white suit.

Now, while Morricone’s score is grandiose and melodramatic, it’s still got a lot of nuance and sincere emotional impact. Costner, Connery, Garcia, and Smith immediately establish themselves as a team. De Palma doesn’t spend a lot of time just relaxing with the characters, but there’s some of it and a sense of camaraderie permeates. It’s in stark contrast to De Niro, who exists to terrorize, whether it be regular people or his own flunkies.

In the first two thirds of the picture, De Palma’s more concerned with the drama. There’s some action, but he’s not focusing on it as much as where it occurs or how it perturbs the plot. In the last third, however, De Palma’s all about the action. Yes, how its affecting Costner–and Costner’s character development–is a thing, but character is secondary to style. And it’s some masterful style. The Untouchables is solid until it all of a sudden becomes exceptional for a while. De Palma, Burum, Morricone, and editors Gerald B. Greenberg and Bill Pankow do some fantastic work finishing up the film.

It’s a fine film, succeeding when it almost shouldn’t–Costner’s earnestness ought to be too much, it’s not; De Niro’s excess ought to be too much, it’s not. Morricone’s score ought to be too much. It’s not. Instead, it’s essential in making The Untouchables work.

It and that Chicago location shooting, of course.