No one should have to help their own mother with her maths homework! Okay, so Katharine's mother wants to go back to school but did she have to choose HER school? Her friends all think Mrs Douglas is great, but Katharine feels embarrassed, especially when she hears rumours about her mother and hedgehog, the maths teacher. As if she hasn't got enough problems of her own to worry about! But then Katharine learns something about her mother which puts everything else into perspective, and unexpectedly brings them closer together.