In 1960s London, Laura Quinn, an executive at the London Diamond Corporation, faces rampant sexism and a glass ceiling that seems impossible to break. Despite her intelligence and hard work, she is overlooked for promotions in favor of her male counterparts. Feeling trapped and disillusioned with her stagnant career, Laura's frustration reaches a tipping point. Meanwhile, Mr. Hobbs, a seemingly unremarkable janitor at the same company, harbors his own grievances against the corporation. With decades of service under his belt, he feels invisible and underappreciated, witnessing the company's unethical practices and disregard for the little man.

Hobbs approaches Laura with a daring proposal: to pull off an audacious heist that would not only allow them to retire comfortably but also serve as retribution against their employer. Initially skeptical, Laura's desperation for change and recognition drives her to contemplate the proposition seriously. The unlikely duo begins to plot an elaborate scheme to steal a fortune in diamonds right from under the company's nose. As they delve deeper into their planning, they navigate through meticulous security systems, internal politics, and the moral complexities of their actions. Their plan, however, also lays the foundation for an unexpected bond between them, challenging their perceptions of justice, loyalty, and the true value of revenge.