Alice (Noomi Rapace), former CIA investigator, works undercover in London. She is reluctant to return to her former job, because in her latest investigation she failed, unable to stop a terrorist attack that caused dozens of casualties. However, a possible biological weapon attack on London makes her change her mind. This decision, however, seems to have been the result of a backstage game, shrewdly driven by the one to be captured, without any delay. And time does not keep up with her.