Her stepmother Fiona does not allow Jo to climb over the fence in the back of their garden. Jo has no idea why and is determined to find out.

Her little adventure quickly turns into a nightmare. Behind the fence is a world full of monsters and demons. Even worse; her brother Daniel followed her. In the chaos of this world she has lost him. She does everything she can to save him, but danger lurks around every corner. Even if they manage to escape from the monstrous world, Jo and Daniel are not safe.

An exciting adventure for girls and boys.