Rosamund Lilley has won a scholarship to the Chalet School, but she doesn't want to leave her family and friends. However, her parents feel that she should go, as it is a tremendous opportunity, and in addition to that, Rosamund is being influenced by Joan Baker, a girl with an unsavoury reputation.
When she arrives at the Chalet School, Len Manyard has been assigned to help her out, and she slowly finds her feet in the school. A few weeks later, Joan turns up at the Chalet School as well! Her father wins the lottery, and decides to send her to school, and she decided to go to the same school as Rosamund.
Joan has a really hard time fitting in, she tries to maintain her influence over Rosamund and some of the younger girls, but Mary-Lou steps in to save the day.