Do you like
Urban Fantasy and its ilk?
Do you like
Lovecraftian horrors Not Of This World?
Do you have
$0.99?
If you answered "Yes" to all of the above then do I have the book for you (ignore the shitty cover art):
Child of Fire is about a man named Ray Lilly and his boss, Annalise Powliss. Annalise is a mage, and a high ranking member of the mysterious Twenty Palace Society. Ray, on the other hand, is a "wooden man", and his job is to act as a decoy while Annalise does her fire and brimstone thing. Together, they hunt down rogue mages who summon extradimensional horrors for their own selfish ends. Horrors which, if left unchecked, can easily devour all sentient life on earth.
Annalise also wants to kill Ray for something he once did, which does not make their job any easier.
Child of Fire is, even by urban fantasy standards, pretty dark. People die, they don't get better later on. It's about sacrifices, what people are willing to do for power and what the heroes have to do to stop them. And it's about trust, with all the various emotional trappings that come with that kind of plotline. This book is also niche, so niche that it doesn't even have a tropes page despite being 3 years old.
Alternatively, you can think of this as Harry Dresden in the Lakeside setting from
American Gods. You can buy the ebook
from Amazon for a measily $0.99, provided you have/are willing to use their Kindle for PC app.