Alicia, Sally and Gwen are in the running for head of form - who will the girls choose to lead them?

Tensions increase between Alicia and Sally when Alicia convinces Darrell to play a prank with invisible chalk. To try and restore order, Mr Parker introduces the dunce’s cap.

The girls arrange a special surprise for Ellen, but it soon backfires. Meanwhile, Darrell uncovers information that threatens the future of Malory Towers.

Gwen's audition for the lead role in the upcoming school play doesn’t go as well as she hoped. Meanwhile, Darrell and Sally try to work on a plan to save the school.

Alicia causes a stir in the classroom when one of her pranks goes horribly wrong. Meanwhile, Gwen’s lie about her father’s health starts to spiral out of control.

An anxious and upset Ellen disappears following a class test, and the girls must search the school to find her. Meanwhile, Gwen is determined to get her hands on Darrell’s diary.

It’s the day of the play, and Miss Grayling invites a potential investor to the school. In a bid to impress him, Darrell is tasked to lead a tour - but all doesn’t go quite to plan.

While trapped in the San, Gwen overhears news that threatens the existence of Malory Towers. Meanwhile, Sally is left by Mam’zelle to take a lesson, but Alicia proves to be a tricky pupil.

Tensions come to a head between Darrell, Alicia and Sally when a sneezing trick is played on Mam’zelle. Meanwhile, Gwen is alarmed when Matron announces a trunk inspection.

Gwen resorts to drastic measures to hide her stolen bounty, while Darrell and Sally make a discovery that could lead them to Lady Jane’s treasure.

The local boys' school play Malory Towers in an inter-school quiz, and Ellen’s reputation is under threat when Darrell catches her sneaking around in the middle of the night.

It’s the last day of school, and Miss Grayling is to sign away Malory Towers for ever. Will Darrell and Sally’s dramatic discovery save the school?