Sixteen-year-old Mara and her ship of refugees are tracking the North Star, desperate to find a homeland in the melted ice mountains of Greenland. The vast, floating city of Pomperoy is just one of the shocks that are not in their navigation plans. Unwittingly, the refugees bring catastrophe in their wake for Tuck, a gypsea pirate-boy, and also for Ilira - a land whose inhabitants exist in a state of terror at the top of the world.

Back in the drowned ruins at the feet of the towering sky city, Fox is beginning his battle with the cruel, corrupt forces that rule the New World. But separated from Mara, his resolve begins to waver . . .

This book is part of a book series called Exodus .

There are 368 pages in this book. This book was published 2011 by Pan Macmillan .

After an early career as a teacher and freelance feature writer for major Scottish newspapers, Julie Bertagna has quickly established a reputation as an author of powerful and original fiction for young people. She lives in Glasgow with her husband and young daughter.