Madge Bettany's plan to start a school in the mountains of the Austrian Tyrol is very exciting for her younger sister Joey - because Joey will be the first pupil.
When another school opens on the other side of the lake, it seems there will be a rival for the Chalet School. But will the girls of St Scholastica's be friends or foes? There are misunderstandings and practical jokes between the girls and soon the two schools are at daggers drawn.