Darrell is excited to welcome her younger sister to Malory Towers, but when Felicity befriends Alicia's mischievous cousin, Darrell's infamous temper threatens to erupt.

Felicity and June learn about possible treasure at Malory Towers, while Darrell's leadership skills are put to the test organising a welcome party for the wayward First Formers.

Gwen learns Clarissa has been keeping a big secret after she falls ill during a lacrosse game. Meanwhile, Irene hears that her father has a new love interest.

With Matron out for the night, the First Form have their first midnight adventure. Susan realises something is amiss with the twins.

Gwen enlists Mary-Lou's help to write a love letter to her new beau at Thackerton College, but when Ron gets involved, it leads to a surprising romance.

When Felicity and June accidentally smash a window during tennis, they uncover an astonishing secret. Meanwhile, Alicia organises a midnight feast in the garden.

Darrell is under pressure to write a speech for the school Open Day, while Sally organises an unusual replacement team for the lacrosse match.

The classroom descends into chaos when June gets her hands on itching powder, but the fun ends when Connie becomes the victim of mean tricks.

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.

Darrell is determined to ace the school cert, but her focus soon shifts when a Second World War grenade is found in the San and Felicity and June can't be found.

Unaware that Ruth is behind the mean tricks, Connie points the finger at another girl in the dorm. Can Ruth do the right thing and honestly confront her twin?

While the school prepares for Mam'zelle and Mr Edwards' wedding, Darrell and June find themselves in grave danger when they uncover new information about the Cruel Captain.