Spoilers. I kept waiting for a relatively dull, talky sequence so I could leave the room for a moment but never had the opportunity. The whole story of the planning, execution, double crosses, and unraveling by the police of the armored car robbery is squeezed into one hour and seven minutes.
The narrative is simplicity itself. Four guys get together under the leadership of Purvis (William Tallman, the guy who played Hamilton Burgerbits on the Perry Mason TV show). The robbery is carried out amidst a cloud of gas with the perps wearing gas masks, out of an earlier movie, "Cross Cross" I think it was. One of the policemen is shot and killed, giving Charles McGraw a revenge motive for catching these guys. A perp is also seriously wounded and his partners shoot him at the hideout. The other three perps are tracked down one by one and either captured or killed. A rookie cop wins his spurs. The final shoot out takes place at an airport, a suitcase holding the booty bangs open when dropped and bills scatter in the wash of the airplane propellors, another familiar scene, at least for Kubrick fans.
There really isn't much to say about this RKO production. Everything is studio-level competent, including the stark black and white photography. The dialogue is dated and amusing and fun to listen to. The suspects are reported as driving not a "Ford" or "Pontiac" but a "black sedan" or a "car, standard make." (You couldn't mention brand names.) Adele Jurgens is a "show girl" who is supposed to be a burlesque dancer. You ought to see her performance. She's dressed from head to toe, bounces onstage and wiggles her shoulders a few times to honky tonk music, and the crowd goes absolutely ape. Oh, that naughty white boa! (The score, by the way, is probably the weakest part of this work.) Men begin sentences with, "Say,....".
It's all stark and economical. It was directed by Richard Fleischer but it could have been anyone. There are no oustanding set pieces, no unusual camera shots, no special effects, no ironic wisecracks, no individualizing quirks, no character development, no hidden philosophical themes. It's pulp all the way. The story could have been lifted from any twenty-five-cent paperback like "True Detective" or from one of the radio programs popular at the time, like "Bulldog Drummond" or "Gangbusters."
It aims to do nothing more than what it does: keep you in your seat waiting to see what will develop next, and, if you don't have a more than usually urgent reason to leave the room, it will probably do that.