The title on the poster appears to be an alternate for a 1934 movie also known as The Scotland Yard Mystery. The IMDB plot summary is “A mad scientist devises a formula that puts people into a zombie-like trance to do his bidding.” Cool! Though possibly inaccurate in light of an alternative summary at Wikipedia: “A criminal doctor operates a racket claiming life insurance by injecting victims with a life suspending serum turning them into living dead.” Original post here.

Sourced to Vixens and Monsters.