The holidays are over, & twins Pat & Isabel O&8217; Sullivan are dying to get back to school. The big question on everybody&8217;s lips is &8211; who will be head girl? Meanwhile, the third form have written a school play, but jealous Fern is plotting to ruin it. & then a terrible accident reveals the true leaders at St Clare&8217;s &8211; & shows up the cheats & cowards too.