The Zodiac Enigma: The Gavin Larson Chronicles

In an empty library, no one can hear you scream. A covert CIA agent stumbles upon the body of an up-and-coming United States Congresswoman deep within the bowels of the Vatican Library, thirty stories underground. A body surrounded by ancient religious symbols stretching back to the origins of the human race. But with the agent operating undercover, the White House can't acknowledge that they know about the body, or ask any pointed questions about how it got there. And, as usual, the Vatican isn't talking.