In 1940 Kenya as their country prepares for war, the local aristocratic social set lives a decadent, self-indulgent lifestyle, that leads to murder. The same events were also dramatised in the feature film White Mischief, which was released seven months after the first transmission of The Happy Valley.

Two couples go on a boating holiday together, and run into some strange people and events.

For two brilliant young athletes - Roger Bannister of England and John Landy of Australia - the 1952 Helsinki Olympics present an exciting challenge. But events help set them on the path to something even more memorable than an Olympic gold medal - the race to break the four-minute mile....