The adventure that began in fire and terror in the night sky over London has brought Jack Flynn and his friends together again, to strike a blow against the forces of a brilliant, sadistic technologist bent on unspeakable destruction. Yet a single blow by itself has not turned the tide of this secret war, and Jack must divide his team to realize any chance of defeating the hidden army arrayed against them. Mercedes Adams evades the assassins sent against her only to be visited by a more dangerous, intimate threat from her past. As her path brings her closer and closer to Jack-on a mad dash from Paris to San Francisco to Los Angeles to Havana, Cuba-Mercedes discovers the hope of survival and salvation in the lessons learned years ago in the freshness of youth, lessons learned by an eager boy, a maverick, an earnest novice...a Tyro.