It's Easter in Reading – a bad time for eggs – and no one can remember the last sunny day. Humpty Dumpty, well-known nursery favourite, large egg, ex-convict and former millionaire philanthropist is found shattered beneath a wall in a shabby area of town.

Following the pathologist's careful reconstruction of Humpty's shell, Detective Inspector Jack Spratt and his Sergeant Mary Mary are soon grappling with a sinister plot involving cross-border money laundering, the illegal Bearnaise sauce market, corporate politics and the cut and thrust world of international Chiropody.

As Jack and Mary stumble around the streets of Reading in Jack's Lime Green Austin Allegro, the clues pile up, but Jack has his own problems to deal with.

And on top of everything else, the Jellyman is coming to town...