This account of the life of Jacques Vaillant de Guelis follows him from his birth in Cardiff, through school and University and French Military Service. Newly married he was recalled to France in 1939 and was assigned to a company of British engineers as liaison officer until reportedly captured. He escaped via Dunkirk, only to return to France a few days later. He retreated south, escaped over the Pyrenees only to be caught again and flung into the Miranda del Ebro Concentration camp. On his release he returned to England where he was recruited by the fledgling SOE, after an interview with Churchill. He became a familiar figure in Baker Street as a recruiting and conducting officer until he was sent to France on a fact- finding mission in 1941. A stay in Algiers in 1942-3 followed when he took part in the liberation of Corsica before returning to London and leading his 2nd mission to France in 1944. In 1945 he joined SAARF and led his last mission to Germany which culminated in collision with another vehicle when he was badly injured. He died later as a result