Exotic dancer. Courtesan. Spy. Double agent. Traitor. The history of Margaretha Geertruida “Margreet” MacLeod, better known as Mata Hari, is fraught with controversy, but, according to an eye witness at her 1917 execution in Paris, one thing is true: Mata Hari was defiant to the end. The third offering from Karen Berger’s new Dark Horse…