Mountains of the moon

Forty years before the Tower of Bones? High in the Mountains of the Moon, the ruins of an immense castle conceal a dark secret. Whole families have vanished from the valleys in the shadow of the mountains, leaving no trace. Four mages are sent to investigate. Wynn Farmer and his companions must battle for their very lives against the strange beasts controlled by a rogue mage and face an evil they never thought possible. Magic and mystery lurk in the Mountains of the Moon. The Gods are at war, and Neveyah is the battleground.