Sally Gardner and Lydia Corry
On the Tindim’s island home, Bottle Mountain is growing terrifyingly tall with rubbish. So tall that one night it breaks away with Barnacle Bell and Granny Shell clinging on tightly as they float off over the waves. None of the other Tindims know where Bottle Mountain is or how to help their friends find their way home . . .
Across the ocean, a boy discovers Bottle Mountain bobbing by the seashore. Can the boy reunite Barnacle Bell and Granny Shell with Rubbish Island? And can the Tindims and the humans help each other to save the planet?