âKiller Kayâ is one of the mystery story from collection which includes the following short stories by Edgar Wallace, a famous British author of mystery genre: âThe Business-Womanâ, âBlue Suitâ, âBattle Levelâ, âThe Air Taxiâ, âThe Convenient Seaâ, âThe Vamp and the Librarianâ, âThieves Make Thievesâ. Fast-paced, with good twists and turns, an unusual mystery scheme and a little romance. Edgar Wallace was an immensely popular British writer of mystery thrillers. Today, Wallace is still popular in Great Britain. His impact has been greatly felt in the German motion-picture industry, where many of his books were made into excellent screen thrillers.