The Finishing Stroke (Ellery Queen Detective, #26)

During the eleven nights before Christmas, the strange gifts and the warnings came. Ellery Queen was there. The police were there. But no one saw the messenger. Ellery Queen knew that the sinister gifts held the clue to the mystery. But what did they mean, and who was the intended victim? Then on the twelfth night of Christmas, the last clue led straight to the corpse...