Two posh girls, Gresham and Eupheme, are sitting on a train at Milton Keynes station when they see a trainspotter: a pathetic, badly-dressed saddo with a terrible haircut and a worse anorak. The two are half-sisters and have always fought: now their argument rages over the trainspotter. Is he doomed to eternal nerdiness or could he be taught to appreciate the finer things in life? Eupheme bets he can: in time for Gresham's engagement party she will have transformed him into a man that her sister would want to sleep with...