Paul Castle loves his son Jack and hates being a Burger Bar Dad. Seeing his son only on Wednesdays and Saturdays pulls him apart. His ex-wife is a thrusting ambitious banker and he is a middling, not very ambitious Birmingham journalist with hopes of being a playwright. The divorce gave her the house, and he got the guilt. He's just about keeping it together, but after a disastrous parents evening, Paul discovers that Jack's mother is planning to move to London and put Jack in a private boarding school. Paul must quickly sort his priorities and his life as he embarks on a hilarious campaign...