Colonel March of Scotland Yard

Colonel March of Scotland Yard is a 1950s British television series based on author John Dickson Carr's (aka Carter Dickson) fictional detective Colonel March from his book The Department of Queer Complaints (1940). Carr was a mystery author who specialised in locked-room whodunnits and other 'impossible' crimes: murder mysteries that seemed to defy possibility. The stories of the television series followed in the same vein with Detective March solving cases that baffle Scotland Yard and the British police. The department itself is sometimes referred to as "D3". Boris Karloff starred as Colonel March.