"İçimizdeki Şeytan" is a novel by Turkish author Sabahattin Ali, published in 1940. The story revolves around the internal struggles of its protagonist, Kerim, who grapples with his desires and moral dilemmas. Set in early 20th-century Turkey, the narrative explores themes of love, betrayal, and the conflict between societal expectations and personal freedom. The novel delves into the complexities of human nature, symbolized by the titular "thing" within us that represents our darker impulses. Through Kerim's relationships, particularly with Melek, the story highlights the tension between passion and conscience, ultimately questioning the essence of good and evil in human behavior.