John is an aspiring composer and pianist at a club and Mary is a single girl that he meets there. When friendship turns to romance, John has to contend with Colin, a charming ladies' man who turns to Mary in times of trouble.

Percy Winthram is a naive young man who still lives at home with his mum. In London for the Cup Final with his friends, he finds himself in a Soho strip club, where he meets blonde hostess Cyrenne. Accepting a bet from friend Ginger, he accompanies Cyrenne back to her flat, and a boast-worthy night of lust seems to be on the cards. However, drained of beer and bravado, Percy's innocence and vulnerability become all too evident.

A chance discovery leads American mining engineer Ben Harris and acquaintance Harold to discover a lost city under the sea while searching for their kidnapped friend Jill. Held captive in the underwater city by the tyrannical Captain (Vincent Price), and his crew of former smugglers, the three plot to escape...

When Chester accidentally memorises and destroys the only copy of a secret Russian formula for a new and improved rocket fuel, he and Harry are thrust into international intrigue, trying to stay alive while keeping the formula out of enemy hands.

Arthur Payne, recently out of prison, meets a stranger, Theo Gaunt, on a train and explains his situation. A few days later another stranger makes a curious proposition. Arthur should participate in a fake robbery and remove some imitation jewellery from the stranger's own safe.