Doomsday Conspiracy by Sidney Sheldon

When Navy Commander Robert Bellamy is assigned to investigate the crash of a NATO weather balloon near an isolated village in Switzerland, he is told that its cargo includes new and highly classified equipment. All witnesses to the accident should therefore be found and questioned. However, as Bellamy conducts his search he begins to suspect that he too is being hunted by an unknown lethal force, and that what he was told about the balloon is only part of an almost unbelievable event. From Washington to London, Zurich, Rome, and Paris, the story unfolds to reveal Bellamy’s past : why the woman he loves the most cannot return his love; why his friends become his deadly enemies; and why the world must never learn the incredible secret hidden in the Swiss Alps. Here is Sidney Sheldon at his best as the master of the unexpected.