Guy Legat is a rising star of the British diplomatic service, serving in 10 Downing Street as a private secretary to the Prime Minister, Neville Chamberlain. Rikard von Holz is on the staff of the German Foreign Office--and secretly a member of the anti-Hitler resistance. The two men were friends at Oxford in the 1920s, but have not been in contact since. Now, when Guy flies with Chamberlain from London to Munich, and Rikard travels on Hitler's train overnight from Berlin, their paths are set on a disastrous collision course.