Living under the alias Jade Johnson, Lisa is a former child prodigy whose past actions are central to the novel's mystery. Her life after faking her death involves creating a new identity while carrying the weight of her decisions.

Danny is Riley's brother, living with resentment and trauma from both his childhood and military service. His anger and isolation reflect the damage caused by family secrets, though he shares a protective bond with Riley.

Frank is the deceased father of Riley, Lisa, and Danny, portrayed through memories and the secrets he leaves behind. His actions, driven by paternal love, set the stage for the family's complicated history.

Jeannie is the best friend of Riley's adoptive mother and the lover of Frank, involved in both revealing and obscuring truths. Her role as a family insider is crucial to Riley's journey of discovery.

Longtime residents of the RV park, Verniece and Tom act as informants whose perspectives are skewed by personal interests. They are involved in revealing partial truths that push Riley forward in her investigation.