Sergeant Coventry

Sergeant Coventry, of the local police, who had first examined into the affair.
He was a tall, thin, cadaverous man, with a secretive and mysterious manner which conveyed the idea that he knew or suspected a very great deal more than he dared say. He had a trick, too, of suddenly sinking his voice to a whisper as if he had come upon something of vital importance, though the information was usually commonplace enough. Behind these tricks of manner he soon showed himself to be a decent, honest fellow who was not too proud to admit that he was out of his depth and would welcome any help.