Chloe is a 32-year-old medical psychologist who works with traumatized teens. She has an intense fear of darkness and relies on prescription medication to suppress her anxiety. As the daughter of a confessed serial killer, she strives to maintain a carefully controlled life in Baton Rouge, but recent missing persons cases threaten her carefully constructed stability.

Daniel is a pharmaceutical representative who frequently travels for work. He met Chloe at a local hospital and bonded with her over shared trauma regarding missing family members. He actively encourages Chloe to confront her fears, planning their wedding near the anniversary of the original Breaux Bridge crimes.

Cooper is Chloe's older brother, known for his confidence and prematurely gray hair. He remains deeply connected to their childhood in Breaux Bridge and serves as a constant reminder of their family's traumatic past. He distrusts Daniel and frequently warns Chloe about her relationship.

Lena is the first young woman who disappeared in Breaux Bridge twenty years ago. She was a confident, independent teenager who left a strong impression on a younger Chloe. She famously wore a distinct firefly belly ring.

Introduced as a reporter from The New York Times, he researches a story about the twentieth anniversary of the Breaux Bridge murders. He contacts Chloe directly, eventually drawing her into a collaborative investigation when new disappearances occur in Baton Rouge.

Mona is Chloe and Cooper's mother. Following her husband's arrest, she experienced severe depression and attempted suicide, leaving her unable to speak or move independently. She communicates with Chloe by tapping her fingers.

Sophie is Daniel's younger sister. Her disappearance at age thirteen deeply traumatized Daniel, creating a shared bond of grief between him and Chloe.

Richard is Chloe and Cooper's father. He is serving a prison sentence after confessing to the murders of six young girls in Breaux Bridge twenty years ago. He took a plea deal to avoid the death penalty, forever altering his family's lives.

Lacey is a teenager coping with her father's abandonment. She covers self-harm scars with bracelets and shares a bond with Chloe over their mutual feelings of isolation.

Aubrey is a fifteen-year-old girl who recently goes missing in Baton Rouge. Her disappearance triggers Chloe's memories of the original Breaux Bridge murders.

Bert is Lena's father. He harbored intense hatred for the Davis family following his daughter's murder and harassed them after Richard's arrest. He now works for a local security system company in Baton Rouge.

Detective Thomas is a police officer investigating the recent missing persons cases in Baton Rouge. He views Chloe with skepticism, questioning her connections to the victims and her reliance on medication.

Ethan is Chloe's former college boyfriend. They dated for eight months before a traumatic incident involving Chloe's roommate caused their separation.

Sarah is Chloe's former college roommate. Her sudden disappearance from their dorm room caused Chloe severe anxiety before the truth of her situation was revealed.

Dianne is Daniel and Sophie's mother. She lives in a rundown house and harbors deep suspicions regarding her family's past tragedies.

Shannon is Chloe's friend who reaches out in a panic when her daughter goes missing.

Riley is Shannon's daughter. Her sudden disappearance escalates the present-day crisis and forces Chloe into direct action to find her.