Colonel March
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Colonel March is a fictional detective created by John Dickson Carr. He appeared in a number of short stories written in the 30s and 40s about "locked-room" and "impossible crime" mysteries. He was an official attached to Scotland Yard in the so-called Department of Queer Complaints.
He was played by Boris Karloff in a British TV series of the 1950s, Colonel March of Scotland Yard.