1. The theory and practice of double cross -- 2. Origins of the double-cross system -- 3. Autumn 1940 -- 4. Organisation for controlling the double-cross system -- 5. The agents' traffic in 1941 -- 6. Experimental plans in 1941 -- 7. The agents in 1941
-- 8. Developments in 1942 -- 9. Work and history of the agents in 1942 -- 10. Activities in 1943 -- 11. Deception to cover the Normandy landings and the invasion of France -- 12. Use of the system in the last year of the war -- 13. Conclusion.
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