Last Stand in Lychford

Celestial beings and human witches clash for the future of the human and fairy worlds in Paul Cornell's Last Stand in Lychford.
There are changes in the air, both in Lychford and in the land of fairy.
The magical protections previously employed by the town are gone, and the forces of darkness are closing in – both figuratively and literally.
Can Autumn and Lizzie save their community, and... well, the world...?
Exploding fairies, the architect of the universe and a celestial bureaucratic blunder make this a satisfying conclusion to the ever-popular Witches of Lychford series.
A Macmillan Audio production from Tor.com