Hidden Pond - Helen Girvan

There was so much at Manoir Laurent that was new and fascinating and Denis, learning to cook, to ski, to do all the things her cousins were eager to teach, found it hard to believe she had ever really expected to be a concert pianist. That had all been part of a plan in which she had little interest. But there were other matters that set her wondering. One of these was the sound of fairy music which seemed to come from the ruins of the chateau on the edge of the forest; another was the whereabouts of Jarret, the boy she had not realized was her cousin when she saw him leave the train several stations down the line the day she arrived. 

All the beauty and old world charm of French Canada is in this story of a girl from 'the States' who found romance and an entirely new way of life among delightful relatives she had not known she was going to love so much when she came to them a stranger.