The Pillars of the World (Tir Alainn Trilogy)

The first novel in New York Times bestselling author Anne Bishop's Tir Alainn Trilogy.

The youngest in a long line of witches, Ari senses that things are changing—changing for the worse. For generations, her kin have tended the Old Places, keeping the land safe and fertile. But with the Summer Moon, the mood of her neighbors has soured. And Ari is no longer safe.
 
The Fae have long ignored what occurs in the mortal world, passing through on their shadowy roads only long enough to amuse themselves. But the roads are slowly disappearing, leaving the Fae Clans isolated and alone.
 
Where harmony between the spiritual and the natural has always reigned, a dissonant chord now rings in the ears of both Fae and mortal. And when murmurs of a witch-hunt hum through the town, some begin to wonder if the different omens are notes in the same tune.
 
And all they have to guide them is a passing reference to something called the Pillars of the World...