Special Agent Alexandra Martel has put her days on the battlefield behind her. Charming and disarming, relentless and lethal, she earned a reputation as one of the most renowned and decorated Army snipers in the service before stepping away. But when Alex, now an FBI special agent on loan to Interpol, learns that an old friend, an MI5 officer, has been killed under mysterious circumstances, she’s pulled back into the dangerous world she left behind.

Following a trail of clues left behind by the dead woman, Alex pieces together a terrifying conspiracy. Dodging death at every turn, she reluctantly joins forces with a CIA officer, but he has plans of his own for her - and will stop at nothing to achieve them.