The film is based on David Walker's 1950 novel of the same title, adapted for the screen by Launder and his co-producer Sidney Gilliat.
Geordie MacTaggart is a "wee" (small) Scottish schoolboy. Although his best friend Jean does not mind his height, after he sees a newspaper advertisement for a bodybuilding correspondence course offered by Henry Samson, he sends for the course and embarks diligently on Samson's fitness programme. By the time Geordie turns 21, he has grown into a tall, fit man who continues to follow Samson's long-distance instructions. Jean, however, disapproves of the amount of time he spends training.
Geordie works as assistant to his father, the local laird's head gamekeeper. When his father later dies, the laird makes Geordie the new gamekeeper.
One day, he gets a letter from Samson, who suggests he take up hammer throwing. On his first attempt, he almost hits the laird, who then tries to show him how it is done. However, the laird's own hammer throw almost hits the local minister, who is passing by on his bike. It turns out that the minister is knowledgeable about the sport; he trains Geordie himself. At the minister's urging, Geordie reluctantly enters a highland games and makes two bad throws. But after the unexpected appearance (and encouragement) of Jean, he wins with his final throw.
Two members of Olympics selection committee visit him and invite him to join the British team for the Melbourne Olympic Games in Australia. Geordie is once again reluctant, as he does not particularly care to compete against others, but finally agrees. He takes the train to London, where he finally gets to meet Henry Samson, who has come to see him off when he boards the ship for Australia.
Unhappy to be away from home, Geordie finds it difficult to be enthusiastic about training on board ship. However, Helga, a Danish female shot putter, takes a shine to Geordie and talks him out of his mood, though Geordie remains oblivious to the fact that she is attracted to him. When they reach Melbourne, Geordie goes sightseeing with Helga before the Games, buying an ugly hat for Jean. An accident occurs nearby, and a man is pinned underneath a car. After several men working together are unable to lift the car, Geordie manages to do it all by himself. His feat is reported in the newspapers, and he becomes very popular.
A problem arises Geordie insists on wearing his late father's kilt in the opening ceremony, something he promised his mother he would do. When he is told that he must wear the same uniform as the rest of the team, he states "no kilt, no throw!" Not having received a reply from London, Lord Pauceton, the head of the British team, gives in. After Geordie comes out last in the opening parade of athletes in his kilt, Pauceton receives a telegram emphatically ordering him not to let Geordie wear his kilt.
During the competition, a listless, dispirited Geordie fails with his first two throws. Then, before his third and final throw, he finds inspiration by recalling Jean's encouragement at his first competition and wins with a world record throw. However, Jean hears on the radio how Helga rushes up, embraces and kisses Geordie in front of everyone in the stadium. She is heartbroken.
On Geordie's return, there is no one to meet him at the station other than his mother. On the way home, they encounter the laird, who tells him that many think his actions have brought scandal to the glen. Then Geordie spots Jean fishing and goes to her. They argue, then fall in the stream. After they get out, Geordie shows her the hat he bought for her; she pretends to think it is "braw" (fine), and they kiss and make up.
The film premiered at the Plaza in London on 2 September 1955,. The Times' poetic reviewer found the film to have, "gracious and decorous atmosphere; the steep hills have stamped themselves on everyone's imagination, so that the story-telling is not flat, the dialogue never airless. The earth is beneath us, the sky above, and to receive messages from both and to interpret them is the splendidly authentic figure of Mr. Alastair Sim's Laird."
In real life, the hammer throw at the Melbourne Olympics was won by American Hal Connolly.
According to the National Film Finance Corporation, the film made a comfortable profit.