A scientist conducting cancer research is convinced that his test monkey was not only stolen but replaced. He is later found dead from gas, and Colonel March must prove if it was suicide or not.
Based on the classic book series Colonel March solves cases that challenge logic and reason.
Starring: Boris Karloff, Ewan Roberts, Phil Brown, Eileen Erskine
Cast
Boris Karloff as Colonel March Of Scotland Yard
Ewan Roberts as Inspector Ames
Eric Pohlmann as Goron
Doris Nolan as Linda
Phil Brown as Dr. Bryan Hayes
Anton Diffring as Davos
Marne Maitland as Thoreau
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