Amber is an ambitious and envious woman who sets her sights on the luxurious lifestyle of the Parrish family. Presenting herself as unassuming and sympathetic, she constructs a tragic background to ingratiate herself into Daphne's inner circle. She is highly observant and calculating, willing to manipulate those around her to achieve the wealth and status she feels she deserves.

Daphne is a beautiful, wealthy socialite living in the elite town of Bishops Harbor. Behind her seemingly perfect marriage and luxurious lifestyle, she struggles with the pressures of maintaining an impeccable image for her demanding husband. She is deeply devoted to her two daughters and remains closely tied to the memory of her late sister, running a charitable foundation in her honor.

Jackson is a charismatic and powerful businessman. He presents himself to the world as a devoted family man who lavishes his wife with expensive gifts and luxury. Beneath his charming public exterior, he expects absolute perfection and compliance from those within his household and company.

Tallulah is the older daughter of Daphne and Jackson Parrish. She is a serious and observant child who handles the high expectations of her father and the protective nature of her mother.

Bella is the younger daughter of Daphne and Jackson Parrish. She is blunt, prone to tantrums, and struggles with learning to read, which causes tension within her father's perfectionist environment.

Meredith is a wealthy socialite and close friend of Daphne Parrish. Unlike the other women in their elite circle, she is highly perceptive and immediately suspicious of Amber, taking independent steps to investigate the newcomer's background.

Bunny is a wealthy woman in Daphne's social circle who serves as co-chair of a major fundraiser. She is secretly engaged in an extramarital affair, making her vulnerable to manipulation by those observing her private life.

Ruth is Daphne's mother, who runs a bed and breakfast in New Hampshire. She frequently feels out of place in her daughter's highly structured, wealthy lifestyle and harbors unspoken tensions regarding the extreme luxury Daphne lives in.

Julie is Daphne's late sister who passed away from cystic fibrosis. Though she is not present in the narrative, her memory drives much of Daphne's philanthropic work and serves as the emotional bridge Amber exploits to enter Daphne's life.

Mrs. Battley is Jackson Parrish's long-time, professional assistant. She becomes the target of extreme workplace sabotage, leading to profound confusion and a disruption of her established career.

Mark is the supportive owner of the real estate firm where Amber initially works. Despite his professional kindness, he is used as an unwitting scapegoat in a fabricated story.

Jenna is the receptionist at the real estate firm. She is friendly and chatty, inadvertently providing valuable gossip about the elite Parrish family through her local social connections.

Sally is Jenna's friend and a former nanny for the Parrish family. During a casual dinner outing, she reveals sensitive, historical rumors about Daphne's personal life.

Gregg is a wealthy, earnest man who enters Amber's social sphere. He becomes a romantic prospect, completely unaware that he is being used primarily as a strategic move to access his wealth and provoke jealousy in others.