First edition copy of the third book in Asimov's Black Widowers mystery series. NY: Doubleday & Company, 1980. First edition. Octavo, 8-1/2 x 5-3/4 in. 182pp. Red papered boards; black spine titles; dust jacket. Light shelfwear, bumping to spine ends. Unclipped ("$7.95") jacket several short closed tears with creases, toning to spine and interior. Near fine in a very good jacket.