The Masque of the Red Death

As a deadly plague ravages the peasants, a deranged prince throws an extravagant masquerade ball for the aristocracy in his castle. When a noblewoman is banished, her long-lost twin sister, who has grown up among the lower classes and is fleeing the disease, takes her place, infiltrating the opulent event as an imposter. Once she gains entry, she finds herself immersed in a lavish realm filled with debauchery, drugs, political plots, vengeance, and even beheadings.