The 13-year-old daughter of Rachel and Marty, who is kidnapped early in the story. She is resourceful and tries to outsmart her captors.

Rachel's ex-husband and Kylie's father, known for his charm and intelligence but somewhat simplistic view of things. He becomes involved later in the story.

Marty’s brother and Kylie's uncle, a veteran who helps Rachel due to his skills in breaking into places. He has a complex relationship with the law and struggles with a personal issue.

The couple who initially kidnap Kylie, driven by their own desperate circumstances within The Chain. They struggle with the moral implications of their actions.

The young child whom Rachel and Pete kidnap under duress to fulfill The Chain's demands. Her story highlights the emotional complexities of parental decisions in dire situations.

A math professor and survivor of The Chain whose daughter suffers lasting trauma. He assists Rachel by using his skills to trace calls and help identify The Chain's leaders.

One of the masterminds behind The Chain, known for her intelligence and manipulative nature. She has a background in law enforcement and complex family dynamics.

Ginger’s twin brother, who contributes to The Chain with his software skills. He is more rational compared to Ginger and shares a complex family past.

Ginger and Olly’s grandfather who renamed them. A former police officer, he is respected by the twins and linked to their complex family history.

The father of Ginger and Olly, who has a violent past and works in the FBI. His legacy impacts the twins long after his death.