Following the death of her parents, when she was five, Giulia Blackowl raises a wall between her and the world, despite the efforts of her brother Emanuele, with whom she lives. But one day the girl tells him a strange dream. Emanuele then takes her to a place unknown to her, Astrum, the island where her parents lived and where they were born.
Here Giulia learns of a secret kept hidden from her for nineteen years and, with the unexpected help of four friends, she will have to save some boys, including her brother, who suffer a strange spell.