Molly is a 25-year-old maid at the Regency Grand Hotel. She struggles with social cues and often misunderstands the intentions of those around her. She finds comfort in the structured routines of cleaning and takes immense pride in returning rooms to a state of perfection. Her literal interpretations of the world often isolate her from her peers, but she maintains a steadfast dedication to her work.

Giselle is the wealthy, younger second wife of Charles Black. She stays frequently at the Regency Grand Hotel, striking up an unusual but genuine rapport with her maid. She recognizes Molly's differences but appreciates her company, occasionally giving her gifts and confiding in her about her troubled marriage.

Rodney is the charismatic head bartender at the Regency Grand. He wears an expensive Rolex watch and projects an air of worldly confidence. He pays special attention to Molly, asking for her help with discreet tasks while framing himself as a modern Robin Hood helping those in need.

Gran is Molly's late grandmother who raised her from early childhood. She worked hard to help her granddaughter understand complex social rules and human behavior. Their shared nightly cleaning rituals formed the foundation of Molly's worldview and current profession.

Mr. Preston is the longtime doorman at the Regency Grand. He is a steadfast, kind-hearted presence who treats Molly with distinct paternal affection, calling her "my dear girl." He observes the daily comings and goings of the hotel with quiet wisdom and offers advice to staff in need.

Detective Stark is the lead police investigator assigned to the death at the Regency Grand. She is pragmatic, direct, and expects people to react to trauma in standard ways. She quickly becomes suspicious of Molly's flat emotional affect and unconventional communication style.

Mr. Snow is the manager of the Regency Grand Hotel. He preaches a "hive mentality" to his staff, expecting them to function as perfectly obedient worker bees. While he recognizes Molly's excellent work, he is generally conflict-averse and fails to address the rampant bullying or rule-breaking among his other employees.

Juan Manuel is an undocumented immigrant from Mexico working as a dishwasher at the hotel. Having lost his housing, he relies on the secret assistance of his coworkers to sleep in vacant guest rooms. He is gentle, hardworking, and deeply appreciative of Molly's kindness.

Cheryl is Molly's direct supervisor in the housekeeping department. She regularly steals tips meant for other maids and does the bare minimum required for her job. She delights in mocking Molly's differences and readily volunteers negative information about her to the police.

The First Mrs. Black is Charles Black's ex-wife and the mother of his adult children. She is fiercely protective of her daughter Victoria's business interests. Despite the bitter divorce, she maintains surprisingly cordial boundaries with Giselle, recognizing the difficult position the younger woman occupies.

Charles Black is a wealthy, aggressive real estate tycoon embroiled in corporate scandals. He treats the hotel staff poorly and exerts cruel, controlling dominance over his young wife, Giselle. His sudden death in his suite sets off the central investigation.

Charlotte is Mr. Preston's adult daughter. She is a successful, high-powered lawyer who maintains a close, loving relationship with her father, occasionally stepping in to offer legal expertise when his friends require assistance.

Wilbur is Molly's ex-boyfriend who dated her briefly before classes began at the community college. He exploited her trusting nature, stealing Gran's valuable Fabergé egg savings and vanishing, leaving Molly humiliated and guarded.

Mr. Rosso is Molly's landlord. He is a constant source of financial stress for Molly, posing a persistent threat of eviction as she struggles to manage her bills on a maid's salary following her grandmother's death.

Victoria is Charles Black's adult daughter from his first marriage. She is currently locked in a vicious legal and corporate battle with her father over control of Black Properties & Investments, harboring intense hatred for her young stepmother, Giselle.

Sunitha is a fellow maid at the Regency Grand Hotel. Unlike Cheryl, she maintains high standards of cleanliness and treats Molly with basic decency, occasionally expressing genuine concern for Molly's inability to recognize dangerous situations.

Sunshine is another maid working at the Regency Grand Hotel. She shares Molly's dedication to proper room cleaning and stands in contrast to the lazy standards promoted by their supervisor, Cheryl.