Terry Pratchett 
The Shepherd”s Crown 

This ebook edition includes an exclusive commentary on the Witches of Discworld, written by Jacqueline Simpson, co-author of The Folklore of Discworld.
A SHIVERING OF WORLDS
Deep in the Chalk, something is stirring. The owls and the foxes can sense it, and Tiffany Aching feels it in her boots. An old enemy is gathering strength.
This is a time of endings and beginnings, old friends and new, a blurring of edges and a shifting of power. Now Tiffany stands between the light and the dark, the good and the bad.
As the fairy horde prepares for invasion, Tiffany must summon all the witches to stand with her. To protect the land. Her land.
There will be a reckoning . . .
THE FINAL DISCWORLD NOVEL