John Smith is a London cabbie with his own taxi, a wife in Streatham, a wife in Wimbledon, and a knife edge schedule. He has been a successful, if somewhat tired bigamist for three years but one day he is taken to hospital with mild concussion. In the ensuing complications, aided by an unwilling Stanley Gardner, John tries bravely to cope with a succession of well meaning but prying policemen, two increasingly irate wives and an hysterical dress designer until he manfully confesses the truth.