A 17-year-old born into poverty in Alabama, Arabella—known as Belle—works in a Richmond gambling parlor to support her destitute family. Beautiful, bold, and fiercely ambitious, she learns from her mother to wield her charm as a tool for survival. When she catches the eye of a wealthy railroad tycoon, she uses her keen intelligence and pragmatism to negotiate a better life, prioritizing financial security over societal approval.

A self-made multimillionaire and railroad magnate who rose from humble beginnings as a traveling peddler. He wields immense wealth and power. Captivated by Belle after meeting her in a Richmond gambling saloon, he offers his vast resources to provide for her and her family, though he struggles to balance his passion for her with his obligations to his existing marriage and societal reputation.

Belle's mother, who runs a boarding house in Richmond, Virginia. Born into a genteel family, she faces ruin after marrying for love and losing her husband to cholera. Her severe hardships forge a stoic pragmatism. She prioritizes survival above all else and instills the same fierce determination in her daughters, pushing Belle to leverage her beauty for financial security.

The young, privileged daughter of Collis and Elizabeth Huntington. She enjoys the protection and luxuries afforded by her father's immense wealth. Her sheltered upbringing shields her from the harsh realities of poverty that shape Belle's worldview. Consequently, Clara views the world through a lens of romance and idealism, often failing to recognize the darker motivations of those around her.

Collis Huntington's wife, a woman who has stood by him for years as he built his railroad empire. She is a dedicated mother to Clara and values her family's standing in New York society. She faces the quiet, agonizing humiliation of societal rumors regarding her husband's infidelities, and she fiercely protects her family's reputation and home life from outside threats.

The slick, charming proprietor of an illicit faro parlor in Richmond, Virginia, where Belle works. Pragmatic and observant, he understands the transactional nature of his business and the people in it. He enters into a lucrative financial arrangement with Collis to maintain a public ruse in New York, serving as a convenient cover for Belle's new life.

Belle's older sister, who shares the cramped attic of their Richmond boarding house. Practical and observant, she encourages Belle to leverage her connection with Collis for the family's advantage. Though supportive, she sometimes chafes against her dependence on her sister and harbors her own desires for autonomy.

Another of Belle's older sisters, who longs to escape the family's impoverished circumstances. Hopeful and conventionally minded, she views their changing fortunes as an opportunity to secure a proper, respectable marriage. Her desires contrast with Belle's more scandalous path to financial security.

Collis Huntington's nephew, who works within his uncle's vast railroad business. Observant and deeply interested in art and history, he crosses paths with Belle during a family trip. His presence introduces a profound emotional complication into Belle's carefully managed life, and challenges her commitment to strict pragmatism over personal desire.

Edward Huntington's wife and the daughter of Elizabeth Huntington's sister. Acutely aware of social standing and propriety, she prefers metropolitan life over the rural postings required by her husband's work. She harbors strict views on social acceptability and resents those she views as improper.

Belle and Collis's young son. His existence brings immense joy to Belle, but it also creates significant complications. Belle must negotiate fraught compromises regarding his place in their complex family dynamic, balancing her maternal love against the demands of Collis's other life.

An emissary for the Town Topics Publishing Company. She visits wealthy socialites to peddle costly biographical subscriptions. These subscriptions serve as thinly veiled blackmail schemes targeting the hidden pasts of New York's elite.

The unseen employer of Lucy Clarence at Town Topics Publishing Company. He orchestrates extortion schemes against wealthy Americans by threatening to publish damaging profiles about their private lives and hidden scandals.

A man from Texas who meets Emma Yarrington during a winter outing in Manhattan. He represents a chance at conventional romance for Emma, though his own financial stability proves to be precarious.

Catherine's late husband and Belle's father. Once a man who married for love, his death from cholera left his family stranded in profound destitution, serving as a bitter cautionary tale for his widow about the dangers of prioritizing romance over wealth.

Known simply as Mrs. Astor, she is the formidable doyenne of New York's "old money" elite. She wields immense power as a social gatekeeper. She determines who is acceptable in high society and staunchly resists the inclusion of those with scandalous or "new money" backgrounds.

A prominent social impresario who manages access to New York high society's most exclusive events. He views his coveted invitations as commodities, and leverages his influence to extract exorbitant fees from eager social climbers.