"The Rules of Scoundrels" is a series of novels by author Sarah MacLean that focuses on a group of four men known as the The Fallen Angels. Set in the Regency era, these gentlemen run a gambling den in London and each book follows the romantic entanglements of one of the members as they navigate love, loyalty, and societal expectations. The series includes four main books: "A Rogue by Any Other Name," "One Good Earl Deserves a Lover," "No Good Duke Goes Unpunished," and "The Day of the Duchess." Each story intertwines themes of redemption and the complexities of relationships, showcasing the characters' growth and the challenges they face in their pursuit of happiness.