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Marthe McKenna was born as Marthe Mathilde Cnockaert in Westrozebeke, Staden, Belgium. She was a Belgian spy for the United Kingdom and its allies duren the First World War. She later became a novelist. |
Titles and year of publication:
| 1) A Spy Was Born | 1935 |
| 2) Drums Never Beat | 1936 |
| 3) My Master Spy | 1936 |
| 4) Lancer Spy | 1937 |
| 5) Set a Spy | 1937 |
| 6) Double Spy | 1938 |
| 7) Hunt the Spy | 1939 |
| 8) Spying Blind (short stories) | 1939 |
| 9) The Spy in Khaki | 1941 |
| 10) Arms and the Spy | 1942 |
| 11) Nightfighter Spy | 1943 |
| 12) Watch Across the Channel | 1944 |
| 13) Three Spies for Glory | 1950 |