There are 1.3 million great whales left in the Earth's oceans today. Climate activist Abi and her AI computer Moonlight are on a mission to protect the planet. When they uncover whale song recordings made by Abi's great-grandfather, a whale hunter, Moonlight discovers a pattern... ...the songs are a map to a future that could rescue the whales and rescue the world. 'A hard-hitting, beautifully written call to arms' Guardian * Daily Mail Best Book of 2022 * * Big Issue Kids' Best Book of 2022 *