Dad en Fifi move to London to a seedy flat in Dale Street; Kennington; and despite initial feelings of horror at her surroundings; Fifi finds London exhilarating. Insatiably inquisitive; Fifi is fascinated by her new neighbours and wants to know what goes on behind all those shabby front doors. But most of all she is fascinated by the Muckles who live opposite in terrible squalor. When Fifi tries to help the Muckles' youngest child; who has been physically abused by her father; Fifi unwittingly unleashes a chain of events which will not only bring heart ache to her and Dan; but terrible danger to all the inhabitants of Dale Street....