I Spy: My Life in Mi5

Tom Marcus, former MI5, joined the Army at 16 and went on to became the youngest member of the Armed Forces to pass the 6-month selection process for Special Operations in Northern Ireland. He was hand picked from the Army into MI5 as a Surveillance Officer. He left the Security Service after a decade on the frontline. He is the author of Soldier Spy, which has been vetted and cleared for publication by MI5.