"That Knocked at the Door", written by the great master of the horror genre, HF Lovecraft, is a story about strange and supernatural events that twist the teacher Daniel Ash into an abyss of fear and madness. He tells the story of a mysterious acquaintance who took possession of his wife, insidiously pushing him away from her. The tangled threads of love, horror, and deception intertwine in this story, developing images of unheard of monstrous creatures and mysterious forces. Will the protagonist be able to save himself and keep his sanity in a world where reality is intertwined with nightmares? What Knocked at the Door is a masterpiece by the master of horror that will leave the reader on the edge of reality and fantasy, reminding us that true horror is often hidden within ourselves.