Rebecca is making sensational progress at tennis and gets into the school team. Her partner is Pippa, her favourite senior and she doesn't want to let her down. But when somebody plays a weird hoax on the school Principal, it looks as though Rebecca is the culprit. Even her friends begin to wonder if she's guilty, all because of her distinctive new party dress...

The sixth title in Anne Digby's classic school series is a most for all lovers of tennis —- and mystery.