Rob's sister Chloe lies in a coma after a riding accident, trapped in a forest of dreams between life and death.

But when a dark druid shape-shifts his way into Rob's life, despair turns to hope. Because the druid knows the way through the Unworld, where he claims Chloe is imprisoned.

Could the ominous black ring of timbers slowly emerging from a secret archaeological dig hold the key to rescuing her? And will Chloe want to be rescued from a world where the landscapes of story merge and blur, and she has the chance to be Queen?

Catherine Fisher's new novel combines a fascinating exploration of Celtic myth with a modern quest for understanding.

Where is the land of the imagination? And if we found our way would we ever want to come back?