After an IRA-sponsored bank heist goes wrong, a seriously wounded man wanders Belfast.
I spent most of this film wondering about the title card at the beginning that pretentiously proclaimed the film was about "the hearts of men" and not the IRA. I kept looking for what the film was saying about the hearts of men, but the collection of characters was more varied and idiosyncratic than can be reduced to types; they don't seem emblematic of a particular political position. I felt like the film wanted to be more reductive than what I saw in it, which is a strange reversal of fortune.
The action sequences, particularly the attempted escape from the bank, were often thrilling. When the film became a character study instead of an action film in the second and third acts, director Carol Reed handled that transition well, though not seamlessly.
James Mason flashes bits of a fleshed-out character, but mostly the script relegates him to playing wounded, but the large, supporting cast is colorful and interesting.
Overall, I don't really know what Odd Man Out is saying or what it thinks it's saying, but the characters are round and mostly interesting, which ultimately makes the film worth watching.