The Angel of Terror by Edgar Wallace.  
When this was written, literary traditions still decreed beauty to be the outward sign of inner saintliness, whereas evil characters tended to be “ugly as sin.” Jean Briggerland defies these expectations by being every bit as angelically beautiful as she is sociopathic. So lovely that all around her are blinded to her guilt no matter how blatant her crimes, only Jack Glover, best friend and lawyer of her most recent victim, is aware of her true nature. Can he stop her crime spree and bring her to justice before she murders her way to wealth and happiness? He really, really shouldn’t count on it. Despite the book’s outrageously implausible plot, it nevertheless manages to keep one in suspense from first page to last. Advisory: Antiquated attitudes and occasional profanity will add unintentional humor to the charms of the story for some listeners but might offend others.