Avery is an unconventional and highly successful consultant based in Washington, D.C. Having lost her therapist license due to controversial methods, she now uses a unique ten-step program to help clients work through crises. She operates as an investigator of sorts, frequently stepping outside traditional professional boundaries to observe her clients' lives. She carries personal grief from the recent death of her husband, Paul, while managing ongoing harassment from a pharmaceutical company she previously reported.

Marissa is the owner of Coco, an elegant boutique, and one half of a seemingly perfect Washington, D.C. golden couple. Beneath her curated exterior, she struggles with intense guilt over a marital affair. She seeks out Avery's unconventional methods to save her marriage, desperate to unburden herself while carefully guarding the full details of her betrayal.

Matthew is a successful professional who projects the image of a devoted family man. He forms the other half of the golden couple, presenting a polished life to the outside world. Confronted with his wife's infidelity during their first consulting session, he reacts with shock and anger, though he appears willing to participate in Avery's ten-step process to work through the crisis.

Skip is a real estate developer and childhood friend of the Bishops, having grown up in the same Eastern Shore town as Marissa. A passionate sailor since his youth, he maintains close ties to his old friends while navigating the complexities of their shared past. He occasionally crosses paths with Avery, having briefly dated her in the months prior to her work with the Bishops.

Bennett is Marissa and Matthew's young son. He participates in Cub Scouts and youth baseball, though he secretly desires to quit sports. He remains a central priority for both of his parents amid their marital difficulties.

Polly is the sole employee at Marissa's boutique, Coco. She is overly eager and talkative, showing a keen, borderline obsessive interest in Marissa's life. Her boundary-crossing behavior, such as wearing her boss's jewelry and staying overnight at the store, creates a low-level anxiety for Marissa.

Chris is Matthew's father, a highly successful Washington, D.C. lobbyist who built a privileged life from a blue-collar background. He maintains a strained relationship with his son, often questioning Matthew's capabilities and decisions.

Natalie is a confident, attractive real estate agent and a mother at Bennett's school. As an ex-girlfriend of Matthew's who still operates in the Bishops' social circle, she frequently triggers feelings of inadequacy and suspicion in Marissa.

Lana is Avery's stepdaughter from her marriage to Paul. Despite Paul's passing, she maintains a warm, trusting bond with Avery, frequently visiting her for support and to share details about her personal life and new relationships.

Paul is Avery's late husband who died eight months prior to the story's events following a battle with a terminal brain tumor. His illness and death profoundly affect Avery's current life and emotional state.

Tina was Marissa's beloved childhood best friend who was tragically murdered during the summer they were teenagers. Her unsolved death remains a dark shadow over the shared history of Marissa, Matthew, and Skip.

Skylar is the controlling, vindictive ex-wife of Cameron, one of Avery's former clients. Holding a grudge against Avery for facilitating Cameron's departure, she reported Avery's ethical violations, resulting in the loss of Avery's professional license.

Cameron is a former therapy client of Avery's. With Avery's unorthodox intervention, he successfully escaped an abusive marriage, though he remains vulnerable to his ex-wife's manipulative tactics.

Derrick is a security company technician and Avery's casual romantic interest. He installed the security systems at Avery's home and occasionally assists her with minor favors, providing a low-stakes connection outside her intense work life.

Finley is a former client of Avery's who worked for the pharmaceutical company Acelia. She confided in Avery about a dangerous drug her company was developing, prompting Avery to act as a whistleblower on her behalf.

Greg is Lana's new romantic partner. He makes a polite introduction to Avery, representing a seemingly positive step in Lana's personal life after a history of questionable dating choices.

Rose is a woman who poses as a new client seeking Avery's consulting services. In reality, she acts as a representative for Acelia, attempting to intimidate Avery into revealing her whistleblower source.

Ray is an unhoused man from the neighborhood around Marissa's boutique. He becomes a minor pawn in the events surrounding Marissa when he is paid to deliver a vaguely threatening message to the store.