It's Christmas Eve and the last day of term at Malory Towers. Everyone is excited for the holidays! After the Christmas Concert Ron introduces his younger brother Fred and his Great Granny Mary to the girls. She used to work at Malory Towers when Miss Grayling was a child, though these days Great Granny Mary has become a little confused...
Crash! There are noises from outside the Dining Hall - but who or what is it? They decide they need help and Ellen has an idea! She rigs up the outside Christmas lights so that they flash the SOS signal. Surely someone will see it?!
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.
