With the third form on a trip to the circus, Darrell and Sally attempt to recover the confiscated peaches from Miss Johnson’s office, but they find more than they expected...

Ron shows Darrell and Sally a stash of art found in the stables, but where did it come from? Miss Johnson is caught off-guard when Miss Grayling arrives back at Malory Towers.

June and Darrell find themselves in danger when they leave the school to continue the search for the treasure in a cave during high tide. The rest of the school prepares for the wedding. Irene is given an important task by her father.

Bill will stop at nothing when she discovers that her horse Thunder is sick with colic. Gwen is charged with keeping Bill away from the stables or else they will both be punished.

Miss Johnson enforces a list of tough new rules which get the better Darrell’s temper. An important lacrosse match is at stake when Darrell is given a particularly difficult punishment.

May-Lou is devastated to find her courage pen smashed on the floor. When Darrell's shoes are found with ink on them, Darrell is the prime suspect, and the North Tower holds a class court.

Alicia convinces Darrell to help her play a prank on their teachers with invisible chalk. Meanwhile, Mr. Parker becomes stricter with his teaching. Mary-Lou finds her voice and stands up for herself.

With Darrell focused on clearing Ron’s name, Mary-Lou and Ellen uncover new information that changes everything they thought about the art thefts.

Malory Towers competes with the local boys' school in a competition. Ellen suffers a panic attack when she is accused of Gwen's misdeeds.

Alicia plans an outdoor midnight feast for her and Darrell. Felicity and June sneak out to search for a hidden room within Malory Towers.

A beautiful dress arrives at Malory Towers: one of the girls is a debutante, destined to marry into aristocracy. When Darrell finds out who the mystery girl is, she's determined to prove the girl is a poor choice.

The girls attempt to make Ellen feel more included but their efforts backfire. Miss Grayling has a secret that might put Malory Towers in danger.

Darrell scouts out players for the lacrosse team, and discovers that Gwen has some hidden talents. Mary-Lou discovers a skin condition that worries her. Matron must fill in for the biology teacher.

Bill struggles to balance her schoolwork with time spent at the stables with her horse, Thunder. Bill and Darrell need Thunder's help when someone at the school has a serious accident.

Darrell’s sister Felicity visits to take an exam that will determine her acceptance at Malory Towers. Darrell wants to enjoy time with her sister but Miss Johnson's strict rules stand in the way.

Darrell and her classmates await their exams while Felicity and June continue to explore the secret room. Gwen pretends to have heart issues to get out of the exam but then finds herself in a dangerous situation.

On a scorching hot day at Malory Towers, Miss Potts lets the first-form girls go down to the pool. Jealous of Darrell and Alicia's new friendship, Gwen takes the fun and games too far.

Darrell is up to play in the lacrosse game, but her excitement is short lived when she finds out they'll be playing against her old school. Darrell must face her past and overcome her temper if she wants to win the match.

Darrell is itching to get to the bottom of Sally's relationship with her family, but when Sally goes missing, the first form rallies together to comb the grounds. Darrell and Sally finally discover the real reason Sally was sent to Malory Towers.

Feeling guilty for lashing out at Mary-Lou, Darrell and Sally hatch a plan to give Mary-Lou the confidence she needs. But will the plan backfire and make Mary-Lou less courageous?

Gwen resorts to drastic measures to hide what she’s stolen. Darrell and Sally find a clue that could finally lead them to Lady Jane Malory’s treasure.

When Clarissa receives troubling news that her pony has been sold, she breaks the rules to rescue him. Irene and Mademoiselle Rougier make efforts to strengthen their relationship.

After a confrontation with Darrell about her family, Sally is found hiding in pain. However, her injuries are far more serious than first thought. Fearing she is at fault, Darrell leaves the school to find a doctor.

Darrell shows a potential investor around Malory Towers. Gwen is confronted with her lies when her mother visits.

Miss Grayling reveals disheartening news. In one last attempt to save the school, Darrell and Sally try to find Lady Jane’s lost treasure. Gwen’s secrets come to light.