The year is 1937. Flying as a fighter pilot with the Legion Condor over the battlefields of Spain's civil war, Dieter Merz has unleashed the fearsome potential of the Luftwaffe's newest fighter plane against Spain's Republican forces. In Dieter's hands, the Messerschmitt Bf-109 is as graceful - and as deadly - as a matador's killing strike: la estocada.

Scotsman and ex-marine Tam Moncrieff is recruited by a nameless intelligence agency in London to go to Germany and sound out Hitler's resolve. Does he really intend to invade Czechoslovakia? Do his generals support him? Can the march to war be stopped?

As duty collides with conscience, fate will bring both men together. These are desperate times calling for desperate measures. To avoid war a killing strike is needed: la estocada. The question is, who is the matador, who is the bull?