The Whispering Woman — Gerald Verner

Paula Rivers, a beautiful, haughty young cinema cashier, is selling tickets when her sister Eileen delivers a portentous note to her: 'BE CAREFUL. PEOPLE WHO PLAY WITH FIRE GET BADLY BURNED. SOMETIMES THEY DIE.' Not long afterward, Paula is found murdered in her booth, shot from behind. Who was the haggard old woman dressed in black who had accosted Eileen and told her to give Paula the note? Called to investigate, Superintendent Budd is faced with one of the most curious mysteries of his career.