- Duchess Day Radley: A tough, 13-year-old girl who acts as a protector and parental figure to her younger brother and mother.
- Walker (Walk): The chief of police in Cape Haven, California, who is dealing with a terminal illness (Parkinson's) and deep guilt over testifying against his best friend, Vincent.
- Vincent King: Returns to town after 30 years in prison for the death of Sissy Radley (Star’s sister); he is a central, enigmatic figure who carries immense guilt and later acts as a guardian to the children.
- Star Radley: Duchess and Robin's mother, who is struggling with addiction, depression, and the lasting trauma of her sister's death.
- Robin Radley: Duchess's five-year-old brother, who is central to the mystery of the plot.
- Dickie Darke: A sinister local figure involved in the central conflict.
- Hal: A character who provides support to the family.
- Martha: A character in the town of Cape Haven.
- Thomas Noble: Duchess's friend
- Dolly: An older friend of Duchess.
- Hank and Busy: Acquaintances and helpers of the family.













