On the train home to London, flapper Samantha Bishop, drinking champagne and thinking of friends and jazz clubs, comes to the aid of a distressed young woman, Nicola White, who says she's seen a murder taking place from the carriage window. No one believes her, but Samantha feels sorry for her and when they arrive in London, they inform the police. However the police don't seem to be able to find any evidence and so, relishing the chance to be the knight in shining armour and for the excitement, Samantha with Nicola begin their own investigation, taking them into the seedy underbelly of the...