Anna's ex-husband and a lead investigator in the murder cases, whose personal and professional life is marked by stasis and self-preservation.

Anna's mother, whose identity is closely tied to her roles as a wife and mother, and who influences the narrative through her protective instincts toward Anna.

Jack's investigative partner in the murder cases, whose role and motivations remain enigmatic and largely filtered through Jack's perspective.

A television anchor and childhood friend of Anna’s, who shares a complicated history with her and serves as her foil throughout the narrative.

A dominant figure in the high school group, remembered for her manipulative and abusive behavior towards others.

A former acquaintance of Anna, depicted as seeking power and validation, with ties to her past school social circle.

An accomplice in Rachel's group, known for her cruel treatment of animals and her troubled past shared with Anna.