1. Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder and the Strange Woman

    Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder and the Strange Woman

    18
  2. Mr. Keen, Tracer of Lost Persons 1950 The King Cobra Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The King Cobra Murder Case

    33
  4. Mr. Keen, Tracer of Lost Persons 1951 The Photograph Album Murder Case

    Mr. Keen, Tracer of Lost Persons 1951 The Photograph Album Murder Case

    37
  5. Mr. Keen, Tracer of Lost Persons 1952 The Gossip Column Murder Case

    Mr. Keen, Tracer of Lost Persons 1952 The Gossip Column Murder Case

    36
  6. Mr. Keen, Tracer of Lost Persons 1951 The Poisoned Sandwich Murder Case

    Mr. Keen, Tracer of Lost Persons 1951 The Poisoned Sandwich Murder Case

    37
  7. Mr. Keen, Tracer of Lost Persons 1951 The Strange Murder of Carrie Ellis

    Mr. Keen, Tracer of Lost Persons 1951 The Strange Murder of Carrie Ellis

    42
  8. Mr. Keen, Tracer of Lost Persons 1949 The Case of the Ruthless Murderers

    Mr. Keen, Tracer of Lost Persons 1949 The Case of the Ruthless Murderers

    42
  9. Mr. Keen, Tracer of Lost Persons 1949 The Case of the Man Who Invented Death

    Mr. Keen, Tracer of Lost Persons 1949 The Case of the Man Who Invented Death

    42
  10. Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder with a Thousand Witnesses

    Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder with a Thousand Witnesses

    37
  11. Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Star of Death

    Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Star of Death

    38
  12. Mr. Keen, Tracer of Lost Persons 1946-The Case of the Glamorous Widow

    Mr. Keen, Tracer of Lost Persons 1946-The Case of the Glamorous Widow

    33
  13. Mr. Keen, Tracer of Lost Persons 1945-The Case of the Absent Minded Professor

    Mr. Keen, Tracer of Lost Persons 1945-The Case of the Absent Minded Professor

    31
  14. Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Bloodstained Necklace

    Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Bloodstained Necklace

    32
  15. Mr. Keen, Tracer of Lost Persons 1945-The Strange Case of Charley Lorimer

    Mr. Keen, Tracer of Lost Persons 1945-The Strange Case of Charley Lorimer

    36
  16. Mr. Keen, Tracer of Lost Persons 1949 The Yellow Talon Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Yellow Talon Murder Case

    54
  17. Mr. Keen, Tracer of Lost Persons 1949 The Silver Dagger Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Silver Dagger Murder Case

    47
  18. Mr. Keen, Tracer of Lost Persons 1949 The Forgotten Cave Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Forgotten Cave Murder Case

    48
  19. Mr. Keen, Tracer of Lost Persons 1950 The Bride and Groom Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Bride and Groom Murder Case

    40
  20. Mr. Keen, Tracer of Lost Persons 1944-The Nightmare Murder Case

    Mr. Keen, Tracer of Lost Persons 1944-The Nightmare Murder Case

    19
  21. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Strange Display

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Strange Display

    16
  22. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Missing Witness

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Missing Witness

    30
  23. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Moonless Night

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Moonless Night

    32
  24. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Leaping Dog

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Leaping Dog

    29
  25. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Flirted

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Flirted

    34