Con man Dudley Jerico sets out to rob corrupt millionaire Victor Rosso of his legendary Gemini diamond, but there's another operator in town who is out to con the con.
Claustrophobic train-set comedy-thriller (produced by H.G. Wells son) with an ace reporter coming up against crooks intent on stealing a gold shipment on the Scotland to London express. A scatterbrained scientist, a gun-toting dame with revenge on her mind and a pair of eccentric spinster crime novelists – who steal the film – round out the motley band of passengers who cross the path of our intrepid hero as he tries to get his big scoop.
Yvonne is seething when her devoted son, Michael, declares his intention to marry Madeleine, despite the latter's admitting to having an affair with a mysterious older man. At the same time, George, Michael's father, confides in Yvonne's sister, Leo, that he is in fact Madeleine's other lover. Together, they hatch a plot to end Madeleine's hopes of marriage - by threatening to reveal George's scandalous secret to his son.
