A woman is found dead on a train, and the name "Rex" has been written on the pull-down blind. It is the third in a mysterious string of "Rex" murders, all carried out on trains. And soon there's a fourth murder. All the victims are discovered to have been the wealthy patients of a doctor who specialises in nervous disorders. The detective novelist Paul Temple and his wife Steve are called in to help Scotland Yard's Sir Graham Forbes solve the case before the serial killer strikes again.
John Bentley ... Paul Temple Dinah Sheridan ... Steve Temple Margaretta Scott ... Mrs. Trevellyan Abraham Sofaer ... Dr. Kohima Celia Lipton ... Norma Rice Jack Raine ... Sir Graham Forbes Alan Wheatley ... Edward Lathom Hugh Pryse ... Wilfred Davies Wally Patch ... Spider Williams Shaym Bahadur ... Rikki Maureen Glynne ... Girl in Boat Michael Golden ... Frank Chester Harry Herbert ... Boatman Aubrey Mallalieu ... Waiter John McLaren ... Leo Brent Ian McLean ... Inspector Crane George Merritt ... Ticket Inspector Mary Midwinter ... Carol Reagan Hugh Miller ... Doctor Steve Race ... Bandleader Gerald Rex ... Boy in Boat Paul Sheridan ... Maitre d`Hotel Marion Taylor ... Esther van Ralston Merle Tottenham ... Millie
