Discover the new Penguin Crime and Espionage series. In the battlefield of World War I, there lies a deadly secret - a secret some are willing to kill for. Paul Mitchell is a young military historian whose life changes forever when two men, Dr. Audley and Colonel Butler from the Ministry of Defense, visit him with a fragment of a German camp map - and many questions. Then, someone tries to kill him. Paul, with his life now in danger, agrees to go underground on a mission to solve a dangerous mystery: what really happened during the Battle of the Somme in 1916? And why does someone want to keep it secret?