Brummell (Purefoy) is a Regency dandy who changes the powders, perfumes, and foppery of male dress to one of elegance and expensive simplicity. He does a makeover on the Prince of Wales (Bonneville) and uses his royal connection to further his extravagant lifestyle. Then Beau meets the much more fascinating Lord Byron (Rhys), falls out of royal favor, and winds up in greatly-reduced circumstances. Based on Ian Kelly's biography.