Many conspiracy theories relate to clandestine government plans and elaborate murder plots. Conspiracy theories usually deny consensus or cannot be proven using the historical or scientific method and are not to be confused with research concerning verified conspiracies such as Germany's pretense for invading Poland in World War II. This book reviews the background, events, and people involved in 22 historical assassinations - all of which involved high-profile individuals (political, religious, or cultural). The evidence (as well as the 'unanswered questions') in these cases reveals that fully half of them are either very highly likely to have resulted from a conspiracy or were proven in a court of law to have been the result of a conspiracy. The cases chose span more than 2,000 years, and come from America, Europe, and Asia. This book shows that, without question, asking the question "Was it a conspiracy or a lone gunman?" is not only a perfectly valid question, it often reveals that the available information makes it highly likely that it was a conspiracy at some of the highest levels.