The term opens with complaints about Inter V, who have the reputation of being one of the worst forms in the school. However, they soon have something different to occupy their time as Jo Maynard realises that it is 21 years since Madge founded the Chalet School. The school is asked for ideas to celebrate the event.
Inter V have plenty of ideas, one of which is accepted by the staff, together with several other suggestions. Matron experiences tragedy and is comforted by Jo Maynard. Several amusing incidents occur which help to occupy her mind occur; one is caused by Inter V and the second by one of the mistresses.
Illness results in a problem for the St. Mildred's pantomime, but one of the Chalet girls steps in to help out; in doing so she helps to avert a serious catastrophe.
As the time passes, it is clear that it will not be a quiet term; an old acquaintance arrives, causing some consternation amongst the staff, and Jo. Inter V have expeditions to Solothern and St. Lorenz, when one of the girls has a shock!
The term ends with Spot Supper, a new event introduced by Miss Ferrars.
If you want to find out more, click on Spoilers
As the link suggests, it gives more of the story - without, of course
giving everything away!