On the morning of her wedding day, fifteen-year-old Elisa is trying to practise the violin piece she is expected to play for the occasion. But she is very sad for two reasons: the man she is to marry is a stranger and her grandmother, who was both her music teacher and her only ally, has just died. In search of a scrap of comfort, Elisa goes to look at the enormous portrait of her grandmother that hangs in her old room. There she finds a jewellery box she has never previously dared to open. After lifting the lid, Elisa finds herself bewitched by a melody that transports her to a labyrinth from which she is unable to escape.