Around midnight shortly after claiming victory in the California presidential primary on June 5, 1968, Senator Robert Kennedy walked into a deadly spray of gunfire. Immediately the Los Angeles Police Department concluded that the assassin, Sirhan Sirhan, had acted alone. The FBI conducted a parallel inquiry and concurred. And the vast majority of the American people accepted their opinion.

In this compelling book--mysteriously suppressed on its initial publication--former FBI agent William Turner and investigative reporter Jonn Christian expose convincing evidence that Sirhan did not act...