Darrell's young sister, Felicity, is in the first form this term, and Darrell is looking forward very much to showing off her beloved Malory Towers to her young sister, but Felicity befriends June, a person who Darrell isn't very keen on. But that doesn't take away the excitement Darrell has when she learns she is made head girl of the Upper Fourth. But being head girl isn't quite as exciting as Darrell hoped it would be, and soon begins to lose her temper.