"The walls really go all the way along the mountains?" said Justin.
"Why is it, Master Holmes, that you never believe anything I have to say?" said Zechariah, busy saddling the steeds.
Justin shrugged. "It's just hard to imagine, that's all."
Sheer faces rose straight up. The walls looked too natural to be manmade yet too perfect to be natural. Nearby, a massive stairway carved into the wall led all the way up to the top, but it had been worn so smooth by the hand of time that the steps were just a rutty, stone slope without handholds of any kind. Justin wouldn't have braved such a climb for all the money in this world or any other. Besides-he didn't want to see what had become of the village of Irth on the other side.