A young girl is travelling to London to find work. Arriving at the station, she meets a man who has been stabbed by a member of a gang of crooks involved with greyhound racing. She becomes a suspect, but flees the scene in order to deliver a message to the dead man's brother. She is protected from the police by a night club entertainer, who she learns is the man she is seeking.

A 1930s British summer Bank Holiday starts at midday on Saturday with a rush for the trains to the seaside. Doreen and Milly are off to a beauty contest, Geoffrey and Catherine are having an illicit weekend in the Grand Hotel and May and the kids are set for a more straightforward holiday of sea, sand, and pub. Meanwhile, the manager and performers on the pier are praying for rain.

When Dr. Howard Latimer finds the German actress whom he had just met at the London Airport murdered in his flat, he is led into a world of murder, blackmail, and a fake passport scam.