When Midlands housewife Coventry Dakin kills her next-door neighbour, in a wild attempt to stop him from strangling his wife, she goes on the run. Finding herself alone and friendless in London, she tries to lose herself in the city's maze of streets. There, she meets a bewildering cast of eccentric characters. From Professor Willoughby D'Eresby and his perpetually naked wife Letitia, to Dodo, a care-in the-community inhabitant of Cardboard City, they all contrive to change Coventry in ways she could never have foreseen . . .