Mr. Campion: Criminologist (Macfadden Mystery, 75-373)

NO MARGIN FOR ERROR...\nCampion had to be right the first time in the cases of--\nAn old schoolmate who died a natural death--and was murdered six months later\nA gangster's rival who was shot in the back---through two concrete walls\nAn elderly countess who thought she was working for charity--and found herself smuggling stolen gems\nA vain old actor who was pronounced dead in the evening--and turned up hale and hearty the next day!\nYou'll meet them all--some alive, some dead, and some in between--in this collection of disagreeable people and incredible events.\nContents: “The case of the late Pig” and the Short stories: — “The case of the white elephant” — “The case of the man with the sack” — “The border-line case” — “The case of the widow” — “The case of the pro and the con” — “The case of the old man in the window”