Roger Bushell was 'Big X', mastermind of the mass breakout from Stalag Luft III in March 1944, immortalised in the Hollywood film The Great Escape. Very little was known about Bushell until 2011, when his family donated his private papers - a treasure trove of letters, photographs and diaries - to the Imperial War Museum. Through exclusive access to this material - as well as fascinating new research from other sources - Simon Pearson has now written the first biography of this iconic figure.