AllMovie

A gorgeous con artist sells a fake painting to a powerful gangster and discovers that crime doesn't pay when her unsatisfied customer hires Europe's top assassin to take her out. But the moment Victor (Bill Nighy) gets Rose (Emily Blunt) in his crosshairs, he hesitates. The situation grows tense when Victor vows to protect the sprightly scammer rather than rubbing her out, and finds himself the unwitting mentor to a young protégée. Before long, all three are on the run from Europe's second-best assassin.