Will (Grant) is a rich, child-free, irresponsible Londoner who, in search of available women, invents an imaginary son and starts attending single parent meetings. As a result of one of his liaisons, he meets Marcus (Hoult), an odd 12-year-old with problems at school and a depressed mother (Collette) at home. Gradually, Will and Marcus become friends, and as Will teaches Marcus how to be a cool kid, Marcus helps Will to finally grow up, fall in love and possibly even commit to a real adult relationship with a lovely single mother (Weisz).
Based on Nick Hornby's best-selling novel by the same name. Nominated for a 2002 Oscar for Best Writing, Screenplay Based on Material Previously Produced or Published.