Tracking a young British soldier who fights for his life after being stranded by his unit on the vicious streets of Belfast, this 1971-set thriller is as grubby, tense and frenetic as the Northern Ireland conflict itself. Debutant Yann Demange does a sterling job in the director's chair, bringing a Paul Greengrass-esque urgency to the action with a combination of regular close-up shots and (not-too-shaky) hand-held camera work. Demange wisely opts for a quality over quantity approach to the brutal violence too, resulting in a few impactful events of savagery and gore that enhance the tension and dread rather than exploit it. Occurring over one night only, Demange – working from Gregory Burke's sparing, taut script – wrings suspense from moments as small as an uncomfortable conversation in a bar, and as big as a cat-and-mouse set piece in an apartment complex or the dazed aftermath of an explosion. It's not all smooth sailing though. The relatively unexplained bookending scenes are a tad cheesy and add little, whilst the bulk of the supporting characters are rarely more than stereotypes, albeit played with gusto. But this movie unmistakably belongs to lead actor, and recent BAFTA Rising Star winner, Jack O'Connell. His Private Gary Hook is resilient yet fragile, strong-willed yet frightened, making him a relatable everyman who will do anything to stay alive. It's not a film you could call "fun", but it's a riveting watch that rewards those willing to be immersed in its gritty and uncompromising survival story.