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Joanna (Keira Knightley) and Michael Reed (Sam Worthington) are a happily married couple. However, the fate of their marriage rests on how each responds to temptation during a night apart. Michael goes away on a business trip with an attractive colleague named Laura (Eva Mendes), whose outer beauty masks a deep loneliness. Slightly jealous, Joanna encounters a former flame (Guillaume Canet) and agrees to meet him for drinks, but the innocent date may become something more. Wikipedia