New York, William Morrow, 1983. First edition. Review copy with slip laid in. INSCRIBED by author to title page. Tyler and Evelyn Robins and their six grown children are murdered one by one, and the challenge is for the reader to ascertain whodunit. The publisher offered a $10,000 prize to the reader who wrote in with the best solution to the crime. Near Fine in NF dust jacket, the latter showing a touch of wear. Note: contest no longer valid. $15.00.