Aired July 11, 1948 on NBC Radio with Howard Duff as Spade. Sam meets a mystery woman with no memory and a corpse that's been killed by a buzz saw! Sandra Gould replaces Lurene Tuttle as Effie, Sam's secretary. Poppy O'Farrell walks into Sam's office. She has lost her memory and wants Sam to try and trace who she is. All she is aware of is that she was on a cable car that morning and a man came and sat next to her, viciously grabbed her arm and told her that someone called Leverett wanted to see her.