X, Mr., (Edward D. Hoch, 1930- )
--The Will-o'-the-Wisp Mystery (Part One: The Pawn), April, 1971.
--The Will-o'-the-Wisp Mystery (Part Two: The Rook), May, 1971.
--The Will-o'-the-Wisp Mystery (Part Three: The Knight), June, 1971.
--The Will-o'-the-Wisp Mystery (Part Four: The Bishop), July, 1971.
--The Will-o'-the-Wisp Mystery (Part Five: The Queen), August, 1971.
--The Will-o'-the-Wisp Mystery (Part Six: The King), September, 1971.