We all know things are often not what they seem. But how many times have shadowy schemes, twisted plots, and secret conspirators been behind some of history's most newsworthy events?

For example, was Princess Diana the victim of a tragic traffic accident, or a murder scheme? Was TWA Flight 800 brought down by a missile rather than a faulty fuel tank, as the official report says? Was that a flying saucer that crashed in the desert scrubland near Roswell, New Mexico? And what about strip club-owner Jack Ruby? Did his murder of Lee Harvey Oswald signal a far wider conspiracy in the death of John Kennedy?

This 13-episode series from HISTORY looks at all sides of these and other tantalizing questions. Using original documents and interviews with experts and eyewitnesses, it enables viewers to reach their own conclusions. CONSPIRACY? will have you thinking again and again about the history you thought you knew.