Based on real events, A Hill in Korea charts the fortunes of a small group of British soldiers serving in the Korean War. Out on a routine patrol, the soldiers find that Chinese troop movements have cut them off from their own lines. They try to fight their way back to safety but with the enemy surrounding them on all sides, the prospects look bleak. Facing almost insurmountable odds, they decide to stand a fight.

Commander Peter Kent of the Royal Navy and his wife May have three children, ranging form five to eleven years: Peter, Anne and Fusty. Kent comes home after three years abroad with no idea how to handle the children. When Mary has to fly to Canada, Peter takes his children to his father's new country home, which turns out to be a windmill. They end up clashing with an American family in the neighborhood.