1959 film by Mario Mattoli

A chance meeting with a Schlecht agent forces a humble coffee shop manager into the secret world of spies in Swinging London. With the help of his MI5 friend, he poses as the recently dead Major Cavendish who had managed to infiltrate the dreaded organization; he knows that they are intending to assassinate someone - could it be the famous Russian ballerina who has recently arrived for an appearance at Covent Garden?

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.