Have you read _11/22/63: A Novel_? I haven't recommended King since he fucked up the Dark Tower series but this fits here.
Loved it. And it's obviously fiction. But ignoring/downplaying Oswald's ties to the Intelligence Community always struck me as a little silly. I don't know if the CIA masterminded the hit. Or if Lee was just an asset who went rogue. But I do know that there was a concerted effort to cover up his ties to the CIA.
If some omniscient alien offered me a billion dollars if I could correctly answer who was most responsible for the JFK assassination...I'd say it was this man:
Allen Dulles. The first director of the CIA. Until Kennedy fired him. Kinda weird that a "former" spook who hated Jack ended up on the Warren Commission. Probably just a coincidence.