Colonel Johnson is the Chief Constable of Yorkshire.

In Three Act Tragedy, he is described as a "big red-faced man with a barrack-room voice and a hearty manner". He is a friend of Mr Satterthwaite, and is delighted to meet Sir Charles Cartwright, as his wife is a great playgoer. Colonel Johnson tells them what the police have found in the investigation of the death of Sir Bartholomew Strange, including their suspicion of the butler, Ellis, who disappears the morning after the murder.


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