The Doomsday Conspiracy : A Novel By Sidney Sheldon

Commander Robert Bellamy, crack Naval Intelligence agent, has been assigned the top secret job of locating ten people who witnessed the crash of a UFO in Switzerland. The job sends him to six countries, and, as soon as Robert and leaves them, each of the witnesses is violently murdered. He then realizes that several highly-placed representatives from around the world are behind the plot, and that his name has been added to the hit list.