This may be a good book but Franco, shown on the cover, was not a fascist but a traditional Latin authoritarian, not unlike Salazar in Portugal, Batista in Cuba, or Peron in Argentina. He led a coalition of fascists (the Falange), traditional Catholics, and monarchists of two factions (Carlists and Bourbons) against a Communist-Socialist (Republican) government. The Germans and Italians aided his side while the Soviets and Communists throughout the world helped the Republican side. However, Franco, while dealing extremely harshly on the defeated Reds, never aligned with the Axis, staying out of World War II. The Falangist faction shared power with the other non-fascist factions. By 1955, pragmatists in both Madrid and Washington and London determined that aligning Spain with NATO was necessary in waging the Cold War.
Subsequently, the authoritarian nature of the Spanish government lessened and Spain moved to becoming a constitutional monarchy with a democratic parliament.