YMMV / Mexican Gothic

• Complete Monster: Howard Doyle, the owner of High Place, is a former magnate who worked many of the local Mexican populace as slaves unto death. Finding a fungus that grew there, Howard sacrificed his wife Agnes to be the breeding point of the fungus, murdering the priest, infants in Human Sacrifice and burning workers alive. Surviving by transferring his mind to male descendants and erasing them, while using women as abused breeding stock, Howard intends to force heroine Noemi to be part of his family to bear more children to live on eternally.
• Nightmare Fuel: Howard's deteriorated, mushroom-ified state toward the end of the book. Additionally, the idea of having one's entire being erased so that a Complete Monster can take over the body to continue his immortality.