Phoebe is a 30-year-old doctoral student writing a dissertation on society's fascination with the true crime genre. Following her father's death, she temporarily returns to Florida to prepare his house for sale. Her parents' difficult marriage and divorce left her emotionally guarded, causing her to actively avoid close personal connections. Immersed in books about serial killers, she applies a cynical filter to her real-world interactions.

Sam is an elementary school music teacher who lives next door to Phoebe's childhood home. His shaggy hair and late-night activities initially alarm Phoebe, but he is a genuinely kind, empathetic man who cares deeply for his students and colleagues. He approaches his relationships with patience and emotional intelligence, contrasting sharply with Phoebe's defensiveness.

Conner is Phoebe's 23-year-old younger brother. Unlike his sister, he remained living with their father after the divorce. He is an optimistic, self-reflective young man who has worked through his childhood trauma with the help of professional therapy. He loves video games and is deeply committed to his long-term girlfriend, Shani.

Shani is Conner's longtime girlfriend and a hardworking nursing student. She comes from a large, close-knit immigrant family that instilled strong values of care and support. She approaches both her medical career and her personal relationships with genuine compassion and sweetness.

Allison is Phoebe's former childhood best friend. Now an organized and sociable librarian, she is married to a woman and remains grounded in her identity as a Korean woman adopted by white parents. Though her teenage friendship with Phoebe ended badly over a severe argument, she displays maturity and openness when they cross paths again.

Phoebe and Conner's parents had a highly toxic, emotionally abusive marriage before their divorce. The father possessed a volatile temper and struggled with anger management, creating a constant atmosphere of dread. The mother focused heavily on appearances rather than providing genuine emotional support. Their parenting failures deeply shaped both of their children.

Dr. Nilsson is Phoebe's dissertation advisor. She maintains high expectations for her doctoral students and communicates with a curt, intimidating demeanor that frequently causes Phoebe intense anxiety.

Lenore is a stray cat with a tipped ear that wanders around the late father's yard. She provides Phoebe with an unexpected opportunity to practice caretaking and responsibility.

Josue works at the elementary school alongside Sam. He is also a gaming friend of Conner's, providing a social link between the neighbor and the brother.

Barbara is an elementary school employee who is retiring. Sam hosts a party in her honor, demonstrating his supportive nature toward his colleagues.