Tosin Shina, a woman accustomed to the privileges of Lagos's elite, finds her life in ruins when her husband Jide is arrested for his criminal activities as an international drug trafficker. The revelation shatters her once idyllic world, pushing her into a role she never imagined - that of a reluctant drug kingpin. She faces a life-altering ultimatum from the enigmatic Mr. Black, Jide's boss who demands that she continue Jide's operations through her nightclub, SIN, or face dire consequences for her family. Tosin's transition into the criminal realm is fraught with challenges. She must navigate the treacherous dynamics of drug trafficking, keeping her establishment afloat, and evading the ever-watchful eyes of Law Enforcement, led by the relentless Drug Law Agency officer Jackson Onoh and InterPol Agent Emmanuelle Young. As her involvement deepens, Tosin forms an unexpected connection with Leo, Mr. Black's enforcer, who introduces her to the dark intricacies of the drug trade. Amid the chaos, Tosin's relationships with her immediate family take unexpected turns. Her younger brother, TJ, seeks refuge in her empire, bringing his own set of troubles. Titi, her aspiring musician sister, remains oblivious to Tosin's double life, offering unwavering support and a respite from the harsh realities of the criminal world. As the stakes rise, Tosin must not only outwit her husband's rivals but also come to terms with her own moral compass. Her undeniable chemistry with Leo blurs the lines between duty and desire, leaving her torn between the life she's chosen and the yearning for a new beginning. With danger lurking at every corner and her family's safety hanging in the balance, Tosin must summon every ounce of strength to protect those she loves, even if it means embracing the very sin that threatens to consume her. "SIN" is a gripping crime drama that explores the intricate layers of power, deception, and redemption, set against the backdrop of Lagos's vibrant social scene. Audiences will be drawn into a world where alliances are fragile, secrets are deadly, and the pursuit of survival and reinvention takes centre stage.