Dragon's Fire (Dragonriders of Pern #19)

Pellar is an orphan taken in by Masterharper Zist. Though born mute, Pellar is a gifted tracker, and when Zist sets off to take over as harper for Natalon’s coal-mining camp, Pellar - along with his fire-lizard, Chitter – joins him on a secret mission of his own: to find out if reported thefts of coal are the work of the Shunned, criminals condemned to a life of wandering and hardship.

Halla is one of the children of the Shunned. Though innocent of their parents’ crimes, these children …