What challenge or conflict does the protagonist encounter in the story The Tell-Tale Heart?

In Edgar Allan Poe's "The Tell-Tale Heart," the protagonist grApples with his obsession over an old man's vulture-like eye, which he perceives as haunting and unsettling. This obsession drives him to commit murder, believing that eliminating the eye will free him from his torment. However, after killing the old man and concealing the body beneath the floorboards, he is ultimately consumed by guilt and paranoia, leading to his confession. The conflict highlights the struggle between sanity and madness, as the protagonist's mind unravels under the weight of his actions.