From 1938 to 1969 crime novelist and detective Paul Temple and his journalist wife Steve solved case after case in one of BBC Radio's most popular serials. Paul and Steve inhabit a sophisticated, well-dressed world of chilled cocktails and fast cars, where the women are chic and the men still wear cravats. The setting in this episode is London. There are dipsomaniac vamps, amnesiac millionaires, circus knife throwers, snake hipped gigolos, bombs in suitcases, daring burglars, undercover policemen and - of course - sinister foreigners. There is also an object that contains a mysterious secret: in this case a penny on the end of a watch chain.