It's hard enough when your parents separate, but when they form new relationships, everything changes again. Keri's mother has met a new man and he has two children, Sara and Thomas. Sara, who is a couple of years older than Keri, makes it clear that they will never be best friends. Keri is content to leave it that way, but Sara's behaviour gets worse, and it's not just teenage moodiness.On a family ski holiday Keri finds herself in a dangerous situation. Sara's younger brother Thomas has skied off into out-of-bounds terrain because of something Sara said to him in anger. Keri seems to be the only one who can save him.