Sylvia is a young woman in her mid-twenties struggling with severe financial distress and medical debt. After a wrongful termination from her previous caretaking job, she accepts a remote position at a sprawling Montauk estate. She is resourceful and dedicated to her daily duties, though her desperate situation forces her to tolerate an uncomfortable living environment. Her past trauma makes her cautious, yet she remains deeply empathetic toward her new client.

Adam is a wealthy, charismatic man in his mid-thirties and the best-selling author of several mystery novels. He lives in an isolated home in Montauk, acting as the primary evening caretaker for his injured wife. He projects the image of a devoted, heartbroken husband coping with a tragic accident. He quickly shows an intense interest in Sylvia, blurring professional lines with his charming demeanor.

Victoria is Adam's wife and a former nurse practitioner who suffered a severe fall down the main staircase. The accident left her paralyzed on one side of her body, heavily scarred, and largely nonverbal. Before moving to Montauk, she lived a vibrant life in Manhattan filled with close friends and a demanding career. She attempts to communicate with Sylvia using scattered words and hidden digital diary entries.

Mack is a tall, muscular paramedic who works alongside Victoria in a busy emergency room. He harbors a quiet affection for Victoria, frequently prioritizing her happiness over his own desires. As Victoria's romantic relationship progresses, Mack serves as a grounded voice of concern regarding sudden changes in her behavior.

Freddy is Sylvia's high school sweetheart and ex-boyfriend. Their long-term relationship collapsed under the immense strain of shared grief and financial ruin following a family tragedy. Despite Sylvia's repeated attempts to block his number and push him away, he persistently tries to contact her and win her back.

Maggie is the longtime housekeeper at the Barnett estate in Montauk, working for the couple since before the tragic fall. She is welcoming to Sylvia and provides a semblance of normal social interaction in the otherwise quiet house. She often gives evasive answers when questioned about the household's past dynamics.

Irina is a previous domestic worker employed by the Barnetts shortly after their move to Long Island. Her presence at the estate was a significant source of tension and suspicion in the household prior to Victoria's accident.

Eva is the morning nurse hired to care for Victoria. She handles the early medical and hygiene routines for her patient before Sylvia assumes caretaking duties for the remainder of the day.

Carol is an emergency room nurse at Mercy Hospital and a loyal friend to Victoria. She acts as a vital part of Victoria's primary social support network in the city, frequently visiting her and offering advice.

Jeff is Carol's boyfriend. He accompanies Carol on a trip to Montauk to visit Victoria and Adam, providing a polite, outsider perspective on the couple's new domestic setup.

Peter is Adam's literary agent. He travels to the remote Montauk estate to deliver advance copies of Adam's books and manages the professional aspects of the successful mystery-writing career.

Drew is a local emergency responder on Long Island. He answers a distress call at the Barnett estate and performs medical evaluations, bringing unexpected connections to the past.

Esther is an elderly woman whom Sylvia previously cared for. Sylvia's employment ended abruptly when Esther's daughter orchestrated a false accusation, forcing Sylvia to seek new work.