1. 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

    48
  2. 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

    49
  3. 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

    31
  4. 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

    49
    1
  5. 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

    46
  6. 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
    36
  7. Mr. Keen, Tracer of Lost Persons 1951 The Poisoned Sandwich Murder Case

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

    39
  8. 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

    34
  9. 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

    15
  10. 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
    33
  11. 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

    36
  12. Mr. Keen, Tracer of Lost Persons 1950 The Eccentric Millionaire Murder Case

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

    26
  13. 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

    31
  14. Mr. Keen, Tracer of Lost Persons 1951 The Airport Murder Case

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

    20
  15. 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

    26
  16. Mr. Keen, Tracer of Lost Persons 1952 The Silver Candlestick Murder Case

    Mr. Keen, Tracer of Lost Persons 1952 The Silver Candlestick Murder Case

    32
  17. Mr. Keen, Tracer of Lost Persons 1950 The Quicksand Murder Case

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

    17
  18. 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

    41
  19. Mr. Keen, Tracer of Lost Persons 1952 The Mother's Plea Murder Case

    Mr. Keen, Tracer of Lost Persons 1952 The Mother's Plea Murder Case

    33
  20. 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

    41
  21. Mr. Keen, Tracer of Lost Persons 1949 The Forgotten Cave Murder Case

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

    49
  22. 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

    13
  23. Mr. Keen, Tracer of Lost Persons 1950 The Telephone Book Murder Case

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

    19