Dapper, dynamic, overarchingly ambitious, Guido Schmidt was Austria's youngest and most controversial Foreign Minister. Corresponding secretly with G ring while betraying Axis secrets to Sir Robert Vansittart at the British Foreign Office, Schmidt ducked and weaved across a European landscape of increasing menace and treachery. Accompanying the Austrian Chancellor to Berchtesgaden in February 1938, Schmidt alone kept his nerve and negotiated an agreement...