Murder with a Past Lib/E (Ellery Queen Mysteries

Who killed Cox, the robber? Was it Ruth Tully, who visited Crandall Cox on the night of his death, and who might have decided to quench a torrid past with a spray of bullets? What about Sandra Jean, the knock-'em-dead beauty, who knew more than she was telling about the sudden demise of blackmailer Cox? Or had some past scandal driven lawyer Ollie Hurst and his wife, Norma, to claim the blackmailer's life? Dave Tully didn't know who the killer was, but if he didn't find out fast, the price of failure could be death ...