Emma is sixteen years old and in love with Andrew, but he's engaged to Julie, Emma's beautiful elder sister. When their two families go to France on holiday together Emma is perturbed by Julie's casual attitude to the engagement and her interest in Yves Courtelle, another guest at the hotel. Emotions become hopelessly entangled, and for the four young people, the holiday threatens to end in tragedy as they struggle with feelings which are stronger than they are.