The Scotland Yard Mystery
The Scotland Yard Mystery is a 1934 British crime film directed by Thomas Bentley and starring Gerald du Maurier, George Curzon, Grete Natzler, Belle Chrystall and Wally Patch. A criminal doctor operates a racket claiming life insurance by injecting victims with a life suspending serum turning them into living dead. The film is based on a play by Wallace Geoffrey. It was made by one of the biggest British companies of the era, British International Pictures, at their Elstree Studios.
Source: Wikipedia
