El Diablo me obligó

"El Diablo me obligó" ("The Devil Forced Me") is a Spanish-language novel written by F.G. Haghenbeck that serves as the basis for Diablero.

Synopsis
Elvis Infante, who after the death of his possessed brother became a hunter of demons which he sells on the black market, finds himself in over his head with a false priest, international gangsters, Afghan War veterans, and a hitwoman.