Liam is a self-made real estate tycoon and the founder of Noone Properties. Growing up in Brooklyn, he pushed himself to achieve immense material success to escape his difficult youth. He is known for his exacting professional standards and emotional distance in his personal life, regularly compartmentalizing his relationships with his wives and children.

Nora is Liam's daughter from his first marriage and an independent, talented architect. Unlike her brothers, she adamantly refuses to join the family real estate business, preferring to build a career based on creativity rather than material wealth. She is intelligent but often faces challenges maintaining emotional intimacy in her romantic relationships, mirroring her father's aloofness.

Sam is one of Liam's twin sons from his second marriage. He works as an executive at Noone Properties, having abandoned early aspirations in sports following an injury. He projects confidence and a focus on material wealth, though he secretly harbors doubts about his current path. Following his father's passing, he becomes convinced that Liam was the victim of foul play.

Joe is Liam's cousin, oldest friend, and a foundational business partner at Noone Properties. He grew up alongside Liam in Brooklyn and has remained fiercely loyal to him throughout their adult lives. He handles executive decisions at the company and is highly protective of Liam's private affairs.

A highly intelligent and perceptive woman who shares a deep, lifelong connection with Liam Noone. Originally hoping to become a writer, she eventually pivots to a practical career path, becoming a key executive at Noone Properties. She commands immense respect within the company but remains a complex and closely guarded figure.

Tommy is Sam's twin brother and an executive at Noone Properties. Highly educated with both a law degree and an MBA, he approaches life with a laser focus on his career. His dedication to work often supersedes his personal life, creating friction within his marriage and distancing him from his siblings.

Jack is Nora's fiancé and the head chef at a popular Brooklyn restaurant. He first met Nora in middle school before reconnecting as adults. He provides a calm, stable presence in her life and is passionate about his culinary career, viewing it as an outlet for creativity.

Cece is a wealthy real estate developer and long-time friend of both Liam and Joe. She grew up with the men and briefly dated Liam in college before establishing her own successful career. She commands respect in the industry and keeps tight-lipped about her private dealings with the Noone family.

Morgan is Sam's 25-year-old fiancée. She is somewhat disengaged from the practicalities of building a life with Sam, often appearing more interested in her devices than in the details of their upcoming home renovation.

Detective O'Brien is the lead investigator assigned to Liam Noone's death. He handles the case with standard procedural care but is met with hostility from Sam, who refuses to accept the official ruling of an accidental fall.

Rachel is Liam's first wife and Nora's mother. She was fiercely independent and instilled a strong sense of self-reliance in her daughter before her tragic passing in a cycling accident prior to the events of the novel.

Sylvia is the mother of twins Sam and Tommy. Her marriage to Liam ended in divorce, though she remained tangentially connected to his life as the mother of his sons.

Inez is Liam's third wife. Though their marriage was short-lived and produced no children, she maintained a friendly, amicable relationship with him in the years following their split.

Clark is the long-time property manager at Windbreak, Liam's coastal California cottage. He is deeply familiar with the property and carries a heavy sense of guilt for not being present on the night Liam died.

Elliot is Nora's ex-boyfriend and a practicing cardiologist. He maintains a persistent presence in Nora's life, frequently calling her and complicating her current relationship, while also possessing professional knowledge of some figures in Liam's circle.

Paul is a renowned photographer and Grace's husband. He is highly protective of his late wife's belongings and becomes defensive when Nora and Sam question him about her work laptop and her ties to Noone Properties.

Kira is Tommy's heavily pregnant wife. She lives on a vast upstate property and often feels secondary to her husband's intense dedication to Noone Properties, leading to a somewhat cool and intractable demeanor.

Taylor is Sam's ex-girlfriend, whose family farm was preserved by Noone Properties. Though she recently married someone else, she maintains a gentle, lingering affection for Sam while recognizing his emotional limitations.

Meredith is one of the witnesses who discovered Liam's body on the beach. She provides Nora with vague but crucial details about a mysterious man seen near the scene.

Jonathan is the tight-lipped and highly professional lawyer for Noone Properties. He is known for his discretion regarding Liam's estate and business affairs.

Ben is a long-time friend and neighbor of Liam's at his coastal California property. He offers his condolences to Nora as she searches for answers near the cliffs.

Austin is Elliot's young son. He shares a sweet, enduring bond with Nora, who makes a point to attend his events despite her complicated relationship with his father.