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Tom Marcus, who uses this pen name to protect his identity, is a former MI5 surveillance officer. In his book, Soldier Spy, he recounts how he was recruited to the service following a stint in the army which he joined at 16. Tom talks about the book, written with the co-operation of MI5, which gives a vivid account of the life of an undercover operative tracking down those who pose a threat to our national security. Libby Purves presents. First broadcast on Midweek, 26 October 2016.