After the death of his father Gabriel, Adrien Agreste, Gabriel's oldest son, becomes the new head of the Russian mafia, labeled as the Prince Of Darkness, because of his intimidating demeanor & he isn't afraid to kill & take possession of whatever or whoever he wants. Famous fashion designer Marinette Dupain-Cheng is living an unhappy life with her boyfriend, who constantly cheats on her & on their wedding day, Marinette flees the city of London & returns back to her home in Paris, to which she gets a job at the Agreste Palace, an elite fashion industry, where Adrien begins to find himself attracted to the bluenette & decides to make her his new slave, in exchange for her to keep her job, a life of luxury, and for Adrien to remain the boss of his industry, as it's actually a cover up for the real dirty work he does. As this occurs, Marinette finds herself in a new terrifying life of crime, death, and romance, as she begins to fall in love with Adrien. But there will be consequences as she becomes the newfound target of the Italian Scarlet Mafia.