Iris (Kate Winslet) is in love with a man who is about to marry another woman. Across the globe, Amanda (Cameron Diaz), realizes the man she lives with has been unfaithful. Two women who have never met and live 6000 miles apart, find themselves in the exact same place. They meet online at a home exchange website and impulsively switch homes for the holiday. Iris moves into Amanda's L.A. house in sunny California as Amanda arrives in the snow covered English countryside. Shortly after arriving at their destinations, both women find the last thing either wants or expects: a new romance. Amanda is charmed by Iris' handsome brother Graham (Jude Law) and Iris, with inspiration provided by legendary screenwriter Arthur (Eli Wallach), mends her heart when she meets film composer Miles (Jack Black).