Darrell’s final year starts with a fierce argument with Gwen, but she knows they need to work together. French student Celeste joins the Third and plays a prank on the teachers.

Darrell enlists the help of the first-year students when facing her first challenge to her authority as head of lower school.

After being selected as head of lower school, Darrell soon feels the demands of leadership when Felicity, her younger sister just starting at Malory Towers, gets into trouble.

Ruth lets her sister Connie take credit for her essay. The first forms try to evade Darrell while searching for treasure.

Clarissa goes undercover to prove that girls can play soccer just as good as boys. Darrell and Susan help Mr. Murray look for ancient symbols in the garden as they continue their archaeology research.

June makes some itching powder for a prank that gets out of hand. Connie blames June for the unfortunate things that keep happening to her, even though June insists she had nothing to do with them.

In an attempt to impress her parents, Gwen auditions for the lead role in the upcoming school play. Darrell and Sally devise a plan to save the school.

When Alicia’s birthday gift from her parents doesn’t arrive, she takes it out on her teachers. Gwen becomes more tangled in her lies.

Darrell struggles to prepare a speech she is to give in front of the whole school. Sally and Bill organize a lacrosse match. Irene’s father delivers news Irene has not been looking forward to.

Felicity and Jo meet a young acrobat girl and Jo promises to take Felicity to the circus. When Jo breaks the rules to fulfill her promise, Miss Grayling teaches her a lesson about friendship. Twins Ruth and Connie start to notice their differences.

When Gwen leaves the school to learn about Darrell’s past, Darrell must try to stop her before it's too late. Meanwhile, not knowing where their dormmates are, the North Tower girls do all they can to cover when the Matron comes for lights out.

In an attempt to impress Alicia, Darrell unleashes a prank in Mam'zelle's class. Trick sweets sent by Alicia's brothers cause havoc in the school, and strange happenings continue when a mysterious red handprint appears in the dorm.

Ellen is stressed that she’ll lose her scholarship and stays up all night studying for an exam. Gwen gets her hands on Darrell’s diary and discovers Darrell's secret.

Preparing for the inter-tower lacrosse match leads to disappointment for Darrell and Felicity. The rest of the team speculates why breakout star Clarissa is hesitant to play.

Felicity and June prove to be a handful when Darrell supervises the class field trip. Meanwhile, Gwen gets more than she bargained for when left with Mr Parker's pregnant wife.

June pulls a daring stunt to save the beloved Malory Oak from being chopped down by Mr. Murray. The Second Form girls learn about chores and hard work. Jo trusts Felicity and Connie with a secret about her mother.

Alicia's family sends a bounty of food, and the girls are all set to have their first North Tower midnight feast. But when Matron wakes during the feast, all Darrell’s worst fears are realized. Will the girls escape?

On open day, Malory Towers bursts with energy and visiting families. But Darrell's joy is short-lived when she finds out her half-term results. She is determined to keep them a secret from her parents.

Alicia and Darrell pull a sneezing prank on their French teacher, which disappoints Sally. Someone has stolen important possessions from the girls.

The first formers try to prank their teachers with Irene's help. Mademoiselle's reaction to the prank raises suspicions for Irene.

In awe of Malory Towers, Darrell keeps her past at her old school a close secret. Always in the thick of it, Darrell has a hairy start at the train station and when odd sounds are heard in the dorm, learns about the ghost of Lady Jane Malory.

Darrell and her class return to Malory Towers. The first order of business: elect a new class leader. Gwen decides to take the new girl under her wing and become her best friend.

A teacher and Gwen are quarantined after finding out they have the measles. Darrell finds out disturbing news about the future of Malory Towers. Sally takes on extra responsibilities.

The girls doubt Ellen’s innocence. Gwen attempts to get rid of the items she stole, endangering Mary-Lou in the process.

The girls welcome Bill and her horse, Thunder, to Malory Towers, but Bill’s place in the third form is under threat when she is accused of spending too much time in the stables. Gwen’s father is offered the position of head of board at the school.