John Smith has been happily involved in a bigamous marriage for five years. He lives with Stephanie in Finsbury and Michelle in Stockwell. Fortunately, for John, he's a taxi driver which involves varying shift work! Simple? Well, when John unwittingly becomes a have-a-go hero and the Finsbury and Stockwell police forces discover something suspicious in their paperwork, John's happy bubble is about to be burst. The action of the movie takes place during the next hectic 24 hours as John, with the assistance of his gullible neighbour Gary, rush between North and South London attempting to thwart the police and prevent the two loving wives coming face to face!