Dr. Anna Fox is a child psychologist who has been confined to her home for nearly a year due to severe agoraphobia. She spends her days spying on her neighbors, playing online chess, learning French, and watching classic black-and-white films. She frequently mixes red wine with prescribed psychotropic medications, which often leaves her disoriented. She longs for connection but struggles with the physical boundary of her front door.

Ed is Anna's husband, currently living separately from her with their young daughter, Olivia. He checks in on Anna frequently, demonstrating patience and concern for her isolated lifestyle. He often advises her to cut back on her drinking and to maintain healthy boundaries with the people she watches from her window.

Ethan is the 16-year-old son of Alistair and Jane Russell, who recently relocated from Boston to New York. He is homeschooled and appears sensitive and fragile, quickly drawing Anna's professional and maternal sympathies. He visits Anna's home to deliver a welcome gift, establishing a quiet bond with the isolated psychologist.

Olivia is Anna and Ed's eight-year-old daughter. She currently resides with her father but keeps in touch with Anna through frequent telephone calls. Her conversations with her mother occasionally show typical childhood impatience, but she remains a central focus of Anna's daily thoughts.

Alistair is Ethan's father, a man who recently transferred his work from Boston to New York under vague circumstances. He projects a rigid, controlling presence within his household. He is highly protective of his family's privacy and reacts poorly to outside interference.

Jane is Alistair's wife and Ethan's mother. As a new arrival to the neighborhood, her presence in the house across the park captures Anna's attention. The dynamics of her marriage and her role in the household become a subject of intense curiosity for the neighborhood's isolated observer.

David rents the basement apartment in Anna's brownstone. He is a handsome, quiet man who agreed to a lease that includes helping out with odd jobs and maintenance around the property. He keeps to himself, frequently hosts overnight guests, and maintains strict boundaries about his personal space.

Dr. Fielding is Anna's precise, clinical psychiatrist. He makes regular house calls to monitor her agoraphobia and adjust the numerous psychotropic medications she requires. He frequently cautions her against mixing her prescriptions with alcohol and assigns her exposure therapy exercises, like holding an umbrella outside.

Bina is Anna's physical therapist, hired to help her rehabilitate from physical injuries. She provides Anna with necessary medical care as well as casual friendship, staying to chat about dating apps and neighborhood gossip after their sessions conclude.

Katie is a young woman connected to Ethan's past. Her history and her attempts to maintain ties with the Russell family create friction, especially with Alistair, who prefers to keep her at a distance.

Detective Little is a large, observant police officer assigned to investigate incidents in Anna's neighborhood. He displays a patient but skeptical demeanor when taking Anna's statements, constantly weighing her claims against the evidence of her heavy drinking and medication use.

Detective Norelli is Little's partner. She is far less patient than Little and takes a more direct, dismissive approach to Anna. She views Anna's behavior and claims through a highly critical lens, heavily prioritizing concrete facts over Anna's hazy recollections.

GrannyLizzie is a 70-year-old woman from Montana who recently lost her husband and subsequently developed agoraphobia. She reaches out to Anna for advice on the Agora website, quickly becoming a trusted online confidant with whom Anna shares personal details.

Dr. Wesley Brill is Anna's former colleague and business partner in her child psychology practice. Though they currently have no active contact, he remains a significant figure in Anna's memory regarding her life before she became housebound.

Punch is Anna's pet cat. He wanders the large brownstone, occasionally bringing Anna dead mice from the basement, and provides her with her only constant physical companionship.