When MI5 learns that a horrifying new weapon is in enemy hands, agent Andrew Harvey is called in to track it down before it reaches British soil. The clock is ticking. Andrew and his girlfriend, Sarah, also a secret service operative, have only one lead: a beautiful refugee, desperate not to lose her son. But is she desperate enough to betray everything she believes in? And will she do it in time to help them prevent a terrifying attack? As Andrew and Sarah race to unravel a convoluted web of subterfuge and exploitation, they discover there is more at stake than even they knew. And somewhere, at the heart of it, lurks a faceless enemy, who is prepared to use everything—and everyone—at his disposal.