It's the perfect weapon. It's small, with a wingspan of less than two feet and weighing less than two pounds. It can go anywhere,flying silently past all defenses. It's controlled remotely, so no pilot is endangered in even the most hazardous mission. It has incredible accuracy, able to effectively strike any target at great distances. It's a UAV, or Unmanned Aerial Vehicle, sometimes called a drone. The U.S. government has been perfecting it as the latest tool of war. But now a prototype has fallen into the wrong hands...and it's aimed at Washington.

The UAV was designed to be unstoppable--but now it must be stopped at any cost. It can carry a camera, deadly gas canisters,or guns as precisely aimed as any sniper's. And Washington is filled with potential targets. Where will the airborne assassin strike？ The Capitol？ The Pentagon？The White House？ The government and the military are racing to stop the threat, but are they already too late？