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Originally posted by Turnbull:
the betrayal came from within--from Fabrizzio, who knew Michael's true identity long before the wedding.
According to the novel, Calo and Fabrizzio were at least somewhat in the dark about who Michael was

Fabrizzio would joke with Michael and ask questions about America, for of course it was impossible to keep them in the dark about his true nationality. Still, they did not know exactly who he was except that he was in hiding and there sould be no babbling about him


"Difficult....not impossible"