"Voodoo Histories: The Role of the Conspiracy Theory in Shaping Modern History" by David Aaronovitch
It seems as though wherever there is a major event in history there is a conspiracy theory. From assassinations to wars and even space exploration, there are many who will argue that the explanation we have been given is not the truth.
In Voodoo Histories, David Aaronovitch probes various conspiracy theories, their origins, why people believe them and where the truth actually lies. Among the theories covered in his book are the Protocols of the Elders of Zion, the assassination of JFK, the deaths of Marilyn Monroe and Princess Diana, 9/11 and the Birther movement.
This book is heavy reading. Aaronovitch takes an in depth look at the history, players and journalism behind the conspiracy theories that are pervasive in today's world. Whether you believe in them or cannot understand why others believe in them, you will be fascinated by how actual events can be manipulated to make people believe that things are never as they seem.