Minutes after a Boeing 747 rises majestically into a Hong Kong sunset, a flash splits the darkening sky. The pilot—suddenly blinded and doubled over in pain—fumbles in the dark in a frantic effort to gain control as the huge jet shudders through its descent. Kat Bronsky, FBI agent and terrorism specialist, is assigned the hunt for a Challenger-class business jet seen nearby just before the incident. The case poses countless questions: Was the flash a pilot error, a missile attack, or a malfunction? Or was it some new kind of weapon? And why are several government agencies interested in what Kat uncovers?