The film is based on the actual events of the Portland Spy Ring trial in the U.K. A disgruntled Navy Clerk is transferred to a secret research establishment and is subsequently black-mailed/paid by Czech intelligence to procure secrets for them. He seduces the secretary who controls the most secret documents, and they enjoy the fruits of their treachery until the British authorities begin to close in on them.

The all-girl school foil an attempt by train robbers to recover £2.5 million hidden in their school.

John Lewis is bored of his job and his wife. Then Liz, wife of a local councillor, sets her sights on him. But this is risky stuff in a Welsh valleys town - if he and Liz ever manage to consummate their affair, that is.