Michael (Sam Worthington) and Joanna Reed (Keira Knightley) appear to have it all. Young and successful, they're a married couple who share a comfortable and seemingly perfect life in their trendy Manhattan apartment. But when Michael finds himself alone on a business trip with an attractive new colleague (Eva Mendes) and Joanna encounters the other great love of her life (Guillaume Canet), each is thrust into an evening of temptation, in this highly provocative film about modern love and marriage.