Temple of Silence by Richard Strachan

Moonhallow harbours a dreadful secret, and it keeps the populace in a perpetual state of anxiety - not that the town's ruthless arbiter is prepared to do anything about it.
Across the great forest to Moonhallow's east, Galen and Doralia Ven Denst return from a gruelling mission for the Order of Azyr, seeking shelter in the mysterious Temple of Silence. However, the two witch hunters won't get much in the way of a warm welcome from the strange priests that reside there as the temple has its own secret, the ramifications of which are inextricably tied to the fate of Moonhallow. When night falls, terrors whose truths are too dangerous to speak come from the trees.