The story takes place in London and English country houses between the two wars, and, like Anthony Powell's A Dance to the Music of Time, occupies the intersection of the aristocratic, the rich, the ambitious, the decadent, the fraudulent and the bohemian. The most important requirement for BYT membership is never to be boring, although one can often be bored. Alcoholism is the recommended lifestyle.
The hero, as so often in comic novels, is an earnest young man who wants to get married but lacks the money. Adam Symes (Stephen Campbell Moore) has great hopes for his new novel, having already spent his publisher's advance, and when his only manuscript is seized as pornography at customs, he is in despair. How can he marry the fragrant Nina (Emily Mortimer) without the money to support her in the style to which she wants to become accustomed? Nina loves him, truly she does, but she hates poverty more.
Adam moves in circles which spin more quickly after midnight, and is a friend of the titled but impoverished Lord Simon Balcairn (James McAvoy), who attends all the best parties and then, as Mr. Chatterbox, writes anonymous scandal about them for a popular newspaper. His publisher is Lord Monomark (Dan Aykroyd), a Canadian press baron who seems to combine the worst (and, it must be said, the best) qualities of Murdoch and Conrad Black, although Monomark is of course the original. Simon has a crisis when his friends discover his double-dealing, and he is uninvited to a crucial party; he implores his friend Adam to cover for him, Adam produces a sensational (if libelous) scoop, and Lord Monomark (who likes to print tonight and call the lawyers in the morning) gives him the Chatterbox column.
This provides Adam with the money to marry Nina, but of course he will lose and regain his stake several times during the film; Waugh's novel, like so much of Wodehouse, is about characters who are realistic about romance but idealistic about money. Adam's rival for the hand of Nina is Ginger Littlejohn (David Tennant), who has money but is boring. Too bad, but to be poor like Adam is boring, too, and if she has to choose, Nina would rather be bored in comfort.
These friends are like sparrows in the springtime, all landing on a branch, chattering deliriously, and then at an invisible signal fluttering off together to perch on another tree. They move from restaurants to clubs to private parties, from town to the country, often awakening hung-over to discover that their genitals have misbehaved during a spell of drunken inattention. The most desperate in their circle is the movie's manic party animal Agatha Runcible (Fenella Woolgar). In a scene that transcends invention and moves into inspired lunacy, Agatha is invited back to spend the night at the house of a tipsy new girlfriend, blunders into the breakfast room in the morning, and as those around the table regard her with horror, reads in the morning paper about where she spent (and is still spending) the night.
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