Jim Garrison was the district attorney of New Orleans. He built up a powerful case for suggesting that President Kennedy's assassination was the result of a conspiracy with the US intelligence community and that Oswald was set up as a fall guy to take the blame. His enquiry was hampered by the mysterious deaths of key witnesses, the disappearance of documents, hostility by the media and from federal government. It led to the only criminal prosecution ever brought for Kennedy's murder - the trial and acquittal of Clay Shaw.
This book inspired the film JFK.