London journalist Iris (Kate Winslet) starts sniffing gas after being strung along for the umpteenth time by her boss, Jasper (Rufus Sewell). Meanwhile, Los Angeles movie editor Amanda (Cameron Diaz) throws her cheating boyfriend out on his ear. Their respective Christmases are going to be miserable, so Iris and Amanda trade places through a house-swap web site — each gets to use the other’s home, car, everything, for a week — to get away from it all.
