Ironically, I have read about 30 books on this mystery. The two most compelling books that I read were Crossfire (based on the conspiracy theory) and another book called Case Closed (based on the lone assassin theory). After finishing both books, I was absolutely convinced on both theories...but I do believe due to the fact that the CIA was a "rogue agency" in the 50's and 60's, Kennedy and his brother had all the reasons in the world to disban the agency...and the agency had all the reasons in the world to ensure JFK never completed that task...