Williams' information is way too detailed to ignore.
Williams says that on the third ballot, Siri was elected and chose the name Gregory XVII. What he doesn't quite get, not being Catholic, is that a papal name isn't chosen until one has accepted the election.
Williams then says that despite his being threatened into changing his mind, on the fouth ballot Siri again had the votes to be elected pope. So the Cardinals were insistent upon Siri, despite his (probably to them mysterious) acceptance and then refusal. According to Williams then, after the fourth ballot, the French Cardinals "annulled the results" [not sure how they would have done that ... maybe saying that he's already refused to accept once]. Then after that they elected Tedeschini as a compromise candidate, but he did not accept due to his age and ill health. Then finally, on the fourth day, they rolled out Roncalli. Roncalli too was said to be a compromise candidate do to HIS age and poor health, but he lasted long enough to appoint Montini a cardinal, call Vatican II, and suppress the Third Secret.
Many have said that Pius XII was slowly poisoned to death, as they wanted to get rid of him before 1960, when the Third Secret was to have been revealed.
Williams is an interesting source. This information is way too detailed to be dismissed as just fiction. Also, it appears in a footnote in his book and is mentioned just in passing. If he were fabricating it, it would seem to me that he would have emphasized it more rather than burying it in a footnote. Initially he listed the specific declassified docuмents in the footnote, but at some point tons of people were contacting him about it and in a later edition he changed it to just "FBI Source". I myself paid a visit to the National Archives in an attempt to find the docuмents, but they were nowhere to be found. Probably de-de-classified by then and removed from the National Archives. I just don't believe Williams simply made that up, given the detail in there, about what happened on each ballot, about the papal name Gregory XVII, about the subsquent election of Tedeschini (which Scortesco confrimed). Perhaps one day these docuмents will see the light of day ... if they haven't been destroyed.