In this affectionate romantic comedy set in London at Christmastime, a group of quirky characters discover the thrills and heartbreak of love-with their spouses, paramours, and new acquaintances. Among the principals are a British prime minister (Hugh Grant) and his new secretary (Martine McCutcheon); a business exec (Alan Rickman), married to a homemaker (Emma Thompson), but enticed by his secretary (Heike Makatsch); and a new bride (Keira Knightley) pursued by her husband's best friend.