As a result of one of his liaisons he meets Marcus, a strange 12-year-old boy with problems at school. Will is a rich, child-free and irresponsible Londoner in his thirties who, in his search for available women, invents an imaginary son and starts attending single parent meetings. 2002. Gradually, Will and Marcus become friends and, as Will teaches Marcus how to be a cool kid, Marcus helps Will to finally grow up.