The Balancing Stone (Paperback) (ISBN-13: 9798215222638)

Toby goes to the Eastern Steppe to investigate sheep rustlers while avoiding the Mongol invaders, who probably aren't from Mongolia and may not be invaders. The large, brown predatory lizards are real enough: fast, silent, and according to one rancher, for every Donn you don't see, there are three Donn you don't see.