Snowfall - K. M Peyton

Sixteen-year-old Charlotte has never known anything other than the
stultifying world of her grandfather's vicarage. But that changes
when her grandfather arranges for her to marry a man who repels
her. Determined to escape, Charlotte joins her brother on a climbing
trip in the Swiss Alps. Soon Charlotte is discovering a life
she could hardly have guessed at. As she and her new friends become
intricately bound to one another, they confront class divisions,
dangerous adventure and the challenges - and secret loves -
of their hidden lives.