Army buddies Ted Peters (Richard Attenborough) and Dave Robinson (Bill Rowbotham) return to London after World War II. Peters gets an honest job as a taxi driver, working a night shift to save money for his wedding. Robinson, looking to make easy money, gets caught up with a gang operating out of a dance hall. When Robinson gets murdered, Peters sends his fiancée (Sheila Sim) under cover as a dance hall girl to prove the gang was involved.