The devils (two volumes)

The brother Diaz was invited to the holy city, and he was certain that a praiseworthy praise and a noble assignment in one of the matters of religion awaited him. However, his new flock is a people of killers with no repentance, and masters of ominous magic, and monsters, and the task entrusted to them requires all of them to spill blood to achieve its just goals. The jinn are lurking at our borders, desiring our flesh, and the greedy princes see nothing but their own greed and comfort. And with a mad journey looming before him, it is better for brother Diaz to have the demons by his side.