Bill O'Reilly and Martin Dugard's book, which deals with Oswald's life mostly. Having personally watched now several documentaries and having read enough about the theories behind the President's murder I liked this movie for one particular reason: It teaches you something. It doesn't matter at the end of the day whether or now you believe that Oswald really did kill Kennedy, but while watching the documentaries on the hundreds of conspiracies, one thing became clear to me: Americans who believe otherwise don't know basic facts.
That having been said I recommend this movie to everyone. The casting blew my mind, the few scenes with Kennedy were fantastic and Lowe had great chemistry with Goodwin, not to mention the exceptional acting by Rothaar. You have hundreds of movies and series made about the Kennedys, so it is great to have one about his (presumed) killer.
Watch it? Absolutely. The movie came out a year and a half ago, just two weeks before the 50th anniversary of the President's death. The book from which it was adapted bears the same name and was a New York Times Bestseller. I recommend that too if you like this topic!
Me? Back to writing my thesis. Until the next item on my list!