Rebecca has never been very good at maths and now, if she doesn't improve, she'll go into the B stream next year and be separated from all her new friends. So why does Max, the dishy new maths teacher, completely ignore her and concentrate all his efforts on lumpy Roberta Jones? And as if that isn't enough to spoil her first summer term at Trebizon, someone has stolen all the money they've raised for charity with a sponsored surfing competition...

The third exciting book in Anne Digby's classic school series.