★★★½Dulcie is a Fairy who works as a regulator monitoring creatures of the netherworld. Her world is one of demons, monsters, witches and warlocks. When a monster turns up on her patch, tearing people she knows to pieces, she finds herself hunting a creature that kills for fun. Helping her is a mysterious regulator who might or might not be on her side.To Kill a Warlock never quite clicks. There are some good moments in it but the good in this book doesn't add up to a good book.