A town busybody is poisoned at a busy reception in the home of famous film star Marina Gregg. The poisoned drink seemed intended for Marina, but Miss Marple is not so sure. She sets out to discover the true identity of the killer before he or she can strike again.

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.

Sir Francis Drake circumnavigates the world in search of adventure and treasure.

Two lads in Edinburgh embark on a non-violent spree of robberies. They dress up in clown masks and act as modern highwaymen, robbing coach loads of tourists in the highlands. In the process they become folk heroes to the locals.