Stanley Moon, a shy and awkward short-order cook, leads a mundane and lonely life in London. Desperately infatuated with his coworker Margaret Spencer, Stanley struggles to muster the courage to express his feelings. In a moment of deep despair after another failed attempt to woo her, he makes a rash decision to end his life. This act inadvertently summons George Spiggott, a suave and charismatic figure who reveals himself as the Devil. George offers Stanley a deal: he will grant him seven wishes in exchange for his soul. Eager to win Margaret's love and improve his life, Stanley accepts the bargain, beginning an unusual journey fraught with unexpected pitfalls.

Each wish Stanley makes unfolds with a twist, as George consistently thwarts his efforts through clever loopholes, revealing the ironic nature of desires. As Stanley navigates various realities crafted by his whims—ranging from becoming a pop star adored by millions to embodying law enforcement power—he finds that each scenario brings unforeseen consequences, often leaving him worse off than before. Through these misadventures, a witty, comical interplay develops between Stanley and George, blending elements of satire and existential comedy. As Stanley reevaluates what he truly desires amidst the chaos ensuing from each wish, the implications of his pact with George grow increasingly complex. Ultimately, he must confront his choices’ deeper meanings and their reflection on human nature—and find a way out of his diabolical predicament.