Xax has taken a convoy of Warriors out on a hunt - and has a fantastic piece of luck when Will and the band stumble right into his path. They are chased by the horsemen across an open plain, with nowhere to hide in sight. Capture seems inevitable, when out of the mists ahead of them their looms a dark and forbidding castle - which certainly wasn't there before ...
With no time to think, the band rolls under the vast gate of the castle just as it clangs shut. Safe from Xax, our heroes discover a new dilemma now faces them.
This is the Castle of Doubt, where every good thing has its evil counterpart, and nothing is what it seems. There are two exits to the Castle: one leads to safety - the other to destruction.
The only inhabitants of the Castle seem to be the Master himself, a benign but infuriating old man who speaks in philosophical riddles, and his two servants, the identical twins Pinto and Tamlin. Tamlin can speak only truth; Pinto can speak only lies - but how is anyone ever to te