The Whispering Mountain (Prequel to the Wolves Chronicles series) - Joan Aiken - Bog

In the small town of Pennygaff, the legendary Harp of Teirtu is found - and lost again. For young Owen Hughes and his friend Arabis, it is the start of a hair-raising race to save the harp from sinister Lord Malyn. As they struggle to keep it out of his hands, they are plunged into a wild adventure involving murder, kidnapping, and savage beasts.