This book reveals the development, strategy and extraordinary success of Britain's secret services in Franco's Spain during the Second World War. The main claim of this study is that British pressure, exercised above all through their intelligence services, led Franco to distance himself from the Axis cause and eventually embrace that of the Allies. Starting from a virtually non-existent base, the British rapidly built up a complex intelligence network in Spain that stretched from Corunna to Barcelona and from Bilbao to Gibraltar. As Spain was a non-belligerent, spy networks -- including those of the Germans, Italians, Portuguese and British -- proliferated in the Iberian Peninsula. Double-agents abounded within these networks; each one knew what the others were up to. The British exploited this two-way traffic to let Franco know that if he did not accede to their demands, they would back a restoration of the Bourbon monarchy under Don Juan. This pressure culminated in the meeting of 1943 between Fr