Fourth of the thrilling fantasy adventure series set on the Dark World, where society is ranked according to its colour clan and the most precious commodity is light.

Tal and Milla are no longer alone in their quest. They have been joined by the rebel Underfolk led by Crow, Tal's old foe. But now they must all work together to discover the secrets of the Castle and the Dark World they all inhabit before it is too late.

The darkness is growing deeper. The shadows are growing stronger. And Tal and Milla are in greater danger than ever before...

This is volume 4 in The Seventh Tower .

This book has been graded for interest at 9+ years.

There are 288 pages in this book. This book was published 2009 by HarperCollins Publishers .

The two Australian authors, Anna Fienberg and Garth Nix, live in Sydney. Anna is known for her popular stories for all age groups. Garth is known for his teenage fantasy novels.