J. G. Reeder is a shabby little man with red hair and weak eyes. However, his extraordinary mind is rapier sharp. Here are three thrilling episodes torn from his casebook: “Red Aces,†about a man who gambles high and lives in fear; “Kennedy the Con Man†reveals the impeccable mask stripped from a fiend, and finally, “The Case of Jo Attymer,†a thoroughly intriguing mystery involving murder on London's Thames.