1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. Mr. Keen, Tracer of Lost Persons 1949 The Engaged Girl Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Engaged Girl Murder Case

    42
  10. Mr. Keen, Tracer of Lost Persons 1944-The Nightmare Murder Case

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

    19
  11. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Woman in Blue

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Woman in Blue

    28
  12. 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
  13. 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
  14. 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
  15. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Frightened Child

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Frightened Child

    37
  16. Mr. Keen, Tracer of Lost Persons 1944-The Case of Mr. Trevor's Secret

    Mr. Keen, Tracer of Lost Persons 1944-The Case of Mr. Trevor's Secret

    19
  17. Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Jewel Thief

    Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Jewel Thief

    60
  18. Mr. Keen, Tracer of Lost Persons 1952 The Case of Murder and the Prize-Winning Bull

    Mr. Keen, Tracer of Lost Persons 1952 The Case of Murder and the Prize-Winning Bull

    43
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