Angela Lansbury got an Oscar nom for her role. She was excellent in the film.
Angela Landsbury was so malevolent as Harvey's mother. She was the brains of it all next to Keigh Deigh(an actor who would later play the Red Chinese super agent Wo Fat on Hawaii 5-0 and appearing on an episode of Kung Fu and having his own tv pilot called Khan, a private detective who is the descendent of Ghengis or Kublai Khan).