Former CIA interrogator Alice Racine is living an inconspicuous life in London after a failed mission in Paris left her scarred. She is drawn back into action when her former station chief, Eric Lasch, contacts her for a critical assignment involving an imminent biological attack planned for the city. Alice successfully extracts vital information from a captured courier but soon finds herself deceived by double agents within her own agency. With the information in the hands of unknown adversaries, she becomes a target and barely escapes an assassination attempt.

Confused and betrayed, Alice teams up with an MI5 agent and a small-time burglar named Jack to uncover the truth. As they dig deeper, they unravel a conspiracy that reaches high levels of government and intelligence agencies. Their investigation leads them on a desperate chase across London, racing against time to prevent the impending catastrophe. Battling compromised allies and relentless enemies, Alice must rely on her skills and instincts to thwart the deadly plot and restore her own credibility within the intelligence community.