The Case of the Poison Pen-Pal: Directed by Arthur Marks. With Raymond Burr, Barbara Hale, William Hopper, Ray Collins. Peter Gregson's aunt is murdered after she investigates a company leak that may involve Peter's old secretary, Karen Ross. Karen travels to San Francisco to see the aunt and, ultimately, is charged with her murder due to pen-pal letters.. The Case of the Poison Pen-Pal - Guest Cast Main Guest Cast Guest Crew Cast Appearances Crew Appearances Gallery
Perry Mason must determine whether word of a planned business merger was leaked through the letters of two little girls.. Where to watch Perry Mason - Season 5 • Episode 20 - The Case of the Poison Pen-Pal free starring Raymond Burr, Barbara Hale, William Hopper and directed by Arthur Marks.