I just finished reading Mark Lane's book. I highly recommend it. Although this is a detail-oriented critique of the Warren Commission, Lane manages to keep the book exciting and even humorous at times. Written in 1966, it's amazing how thorough his demolition of the official story already was at that point. Mark Lane represented Oswald's interests to the Warren Commission at the request of Oswald's mother, Margeurite. Lane did quite a lot of his own investigation and interviewing of witnesses.
He made an accompanying film to the book (that I haven't watched yet): https://www.youtube.com/watch?v=QAnX7atkpyA
He even wrote a book about how his own dissenting opinions were attacked:
http://www.amazon.com/citizens-dissent-Mark-Lane-r...
And his most recent, Last Word: My Indictment of the CIA in the Murder of JFK: