Billy Brown is good at maths but bad at sports. When the Queen is struggling with a maths problem, it's Billy's time to shine!

Only Billy Brown can help the Queen with her difficult maths problem, and she gives him a big gold medal. But when the Queen then comes to stay with Billy's family everything begins to get royally awkward. Then there's Billy's grandma, who used to be a spy ... A right royal riot of a read!