David Balme will be forever known as the 20-year-old hero who boarded a German U-boat in mid-Atlantic and captured one of the greatest secrets of the Second World War. This capture - or 'pinch' as it was known within secret, inner circles - changed the course of the Battle of the Atlantic and shortened the war itself. The story of the capture and ransack of U-110 is told for the first time in the words and letters of David Balme, his captain Joe Baker...