Not much was known about Arthur Kedby in the West End Club that he frequented. ‘He doesn’t look much like a secret agent,’ remarked one member, but in general that was what he was believed to be. But Kedby is a blackmailer, and not even a very successful one; his great success lies in the fact that he has never been caught.

Then he recognises the face of a club guest – a face he has seen before. And all at once Kedby has an opportunity to practise his skills at a level that might just furnish him with a pension …