Prosper’s Demon. Inside Man — K. J. Parker

"Prosper’s Demon" and "Inside Man" by K.J. Parker are dark, sharp-witted fantasy tales of an exorcist who profits from casting out demons, only to find himself sinking deeper into the world of dark forces.

The protagonist is far from a traditional hero—he is cynical, brilliant, and often driven by self-interest. Yet, he stands at the heart of a dangerous web where politics, magic, and demonic entities collide. Every pact with the otherworldly comes at a price, and it soon becomes clear that controlling demons is nothing more than an illusion.