Ten-year-old oddball Eustace, an only child, has life transformed by his mother's quixotic decision to sign him up for cello lessons. Music-making brings release for a boy who is discovering he is an emotional volcano. He laps up lessons from his young teacher, not noticing how her brand of glamour is casting a damaging spell over his frustrated and controlling mother. When he is enrolled on a holiday course in Scotland, lessons in love, rejection and humility are added to daily practice.