Truth to Tell

"Truth to Tell" is a 1972 short story by Isaac Asimov. It is one of Asimov's series of stories about the Black Widowers, a gentlemen's dining club that meets monthly to solve mysteries and puzzles. It was first published in the October 1972 issue of Ellery Queen's Mystery Magazine under the title "The Man Who Never Told A Lie", and was included in the 1974 collection Tales of the Black Widowers.