The Thames ITV series that ran from 1978 to 1983.

When Eric's niece Kathy becomes one of the heirs to a considerable fortune, her life (and those of the other heirs) is placed in jeopardy by the actions of a mysterious inter-loper.

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?

Eric and Ernie decide to take a holiday to the South of France and unwittingly become mixed up with a band of jewel thieves.