The story centres on taxi driver John Smith who has two wives, Mary and Barbara. Striving to keep the existence of each wife from the other, John lives in separate homes: he rooms with Mary in the mornings and beds Barbara in the evenings. Only a strict adherence to this schedule enables John to maintain his double life and keep his bigamy a secret. Unfortunately, John’s careful plan is disrupted when he intervenes in a mugging and gets bonked on the head. Treated in hospital, John is later dropped off at Mary’s place at a time when he should have been with Barbara. The appearance of a pair of nosy detectives complicate matters further as John desperately struggles to hold his scheme together while avoiding arrest and suspicion from his wives.