Kay Scarpetta returns to Cambridge, Massachusetts after a long business trip. She understands that a lot has changed, that she can no longer trust her colleagues, namely her deputy Jack Fielding. In addition, it turns out that he is somehow involved in the murder of a young man who was stabbed to death with an unusual knife while walking his dog. Not far from the victim's body, a fragment of a flyboat is found - a miniature device that can penetrate a person's body. Kay refuses to believe that Fielding is guilty and begins his own investigation. For the first time in Russian.