AQS on one lined page, 3 x 5, November 1, 1989, offering a thought on the mystery genre. In full: “As long as people prefer order to chaos, the mystery story will survive for its very essence is the conversion of the incomprehensible to the clearly understood”; and a TLS signed “Isaac,” one page on a 5.5 x 3.5 postcard, September 20, 1989, describing a book signing. In part: “Nothing but signing, signing, signing, smiling, smiling, smiling, gracious, gracious, gracious. By 4 P.M., it would have been a relief to take a poke at someone—but I didn’t.” In overall fine condition. RR Auction COA.