Publisher's Synopsis
A five-sided card with the letter J stamped on it appeared in Robert York s mail, and a day later he was dead, crushed by a boulder. It was no accident. Someone knew York would be under that rock wall at precisely 7:30. Then another card showed up for Emily York, stamped with the letter H, and Ellery Queen knew he was up against a brilliant killer who made a game of death by warning his victims. The only clue to the murderer s identity was the signature Y, and Ellery had to find him and stop his remorseless vendetta before Y won his mad game."
