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

    48
  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

    46
  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

    41
  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

    42
  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

    37
  6. 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

    52
  7. 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

    35
  8. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Sang Too Well

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Sang Too Well

    2
    0
    40
  9. 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

    50
  10. 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

    53
  11. 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

    35
  12. Mr. Keen, Tracer of Lost Persons 1944-The Case of Murder in the Air

    Mr. Keen, Tracer of Lost Persons 1944-The Case of Murder in the Air

    2
    0
    37
  13. 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

    40
  14. Mr. Keen, Tracer of Lost Persons 1949 The Forgotten Cave Murder Case

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

    53
  15. 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

    45
  16. Mr. Keen, Tracer of Lost Persons 1950 The Case of the Melody of Murder

    Mr. Keen, Tracer of Lost Persons 1950 The Case of the Melody of Murder

    38
  17. Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Missing Car

    Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Missing Car

    45
  18. Mr. Keen, Tracer of Lost Persons 1950 The Case of the Two-Faced Murderer

    Mr. Keen, Tracer of Lost Persons 1950 The Case of the Two-Faced Murderer

    17
  19. Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder at a Mile a Minute

    Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder at a Mile a Minute

    19
  20. Mr. Keen, Tracer of Lost Persons 1950 The Telephone Book Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Telephone Book Murder Case

    23
  21. Mr. Keen, Tracer of Lost Persons 1951 The Airport Murder Case

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

    24
  22. Mr. Keen, Tracer of Lost Persons 1950 The Skull and Crossbones Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Skull and Crossbones Murder Case

    30
  23. Mr. Keen, Tracer of Lost Persons 1950 The Quicksand Murder Case

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

    21
  24. Mr. Keen, Tracer of Lost Persons 1950 The Eccentric Millionaire Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Eccentric Millionaire Murder Case

    30
  25. Mr. Keen, Tracer of Lost Persons 1954 The Shrieking Prisoner Murder Case

    Mr. Keen, Tracer of Lost Persons 1954 The Shrieking Prisoner Murder Case

    39