Slade Carter

Age range 8+Twelve-year-old twins Hugo and Kitty have an ultra-rare condition called heterochromia, which bestows them with different coloured eyes: one hazel, the other blue. On holiday in rural Australia, the twins befriend their solitary neighbour, Lucas, who has developed a powerful solar device he calls the Helios Book.Lucas promises it will revolutionise global energy use. In a desperate attempt...