Over the space of three summers in the early 1970s, at a camp hosted at a private Swiss boarding school, three girls from different backgrounds get to know each other. There's Vivien (talented with food, but shy and awkward), Shirin (a Persian princess with the attitude to match and serious internal suffering), and Ingrid (the wild girl with a heart of gold). While they initially dislike and distrust each other, they develop a strong friendship as they come of age.
This is extremely well-written, but ultimately not really a YA book. It falls more into the category of adult books written about adolescent memories. There are wonderful details and the stories may appeal to older teens, but this is a book for grownups (and probably fairly old ones who remember the early 70s). Few of us will relate to lifestyles where our parents could simply ship us off to elite Swiss schools for the summer!