Merry Arundel comes to Tremayne School, setting in motion a number of events that greatly effect some of the other students, as well as the fate of Sennen House, long languishing in the house competition.

Merry and her friends return to Tremayne School for winter term, and find that they have much to contend with, in the form of new girl Holly Stafford. Will this new pupil ruin Sennen's chance to be top house?

Merry Arundel and her friends return to Tremayne School for the final term of the year, struggling to integrate four new girls into their form and their house. Will the resulting chaos rob Sennen House of its chance to be top, and Pauline of her chance to be Head Girl...?