O’Mara, 1st ed., 1997. 256 pp., photo-plates. D.j., 24 x 15cm. FINE. Yeo-Thomas was an English Frenchman, passionately bound to both countries. He joined the RAF at the outbreak of World War II but in 1942 he joined the Special Operations Executive. He soon became a leading member of its RF Section, liaising with General de Gaulle’s Free French secret services. In 1943, on his third daring mission into Occupied France, he was betrayed and fell into the clutches of the Nazis. His fortitude in captivity, despite the most appalling treatment, confirmed him as ‘the bravest of the brave.’ Despite being tortured he did not reveal a single secret to his Gestapo interrogators. Worse horrors came with his incarceration in Buchenwald concentration camp. Typically, he set about organising resistance within the camp and, when threatened with execution, he swapped identities with a corpse in the camp’s hospital. Captivity in other concentration camps followed until, in the last days of the war, he managed to escape and reach the Allied lines. Here is a fascinating study of the nature of heroism and the terrible reality of fighting behind enemy lines. An authoritative biography drawing upon private papers.