Wren is a dedicated forensic pathologist in New Orleans who views herself as an advocate for the dead. Known for her analytical mind and deep empathy, she works tirelessly to ensure her victims are not forgotten. Her commitment to her job pushes her to visit active crime scenes, such as the bayou where a new serial killer leaves his victims, and she consults closely with detectives on the case.

Jeremy is a medical school student and data entry worker who operates as a serial killer. He owns a property in the Louisiana bayou where he holds victims captive in his basement. He harbors a lifelong fascination with anatomy and pain, stemming from childhood experiences. He views himself as superior to law enforcement and treats his crimes as a psychological game.

John is an experienced detective with the New Orleans Police Department leading the Bayou Butcher investigation. As a second-generation detective, he feels a heavy burden of responsibility to protect the city. The stress of the escalating murders gives him noticeable dark circles, but he relies on forensic science and his team to track the killer.

William, often called Will, is a detective with the New Orleans Police Department. Serving as John's partner, he provides steadfast assistance during the investigation into the serial murders. He approaches police work with a protective instinct and a fresh perspective that contrasts with the older detectives' views.

Katie is a young woman who was lured from a bar under false pretenses and finds herself trapped in a killer's basement. Terrified and desperate, she struggles to comprehend the horrific situation she and her boyfriend are in. Her ordeal highlights the sheer brutality and psychological manipulation inflicted by her captor.

Emily is a medical student at Tulane University. She takes detailed notes during her biology lectures while wearing a silver bracelet with an anatomical heart charm. Trusting and dedicated to her studies, she attempts to be friendly with her classmates, unaware that a dangerous predator sits directly behind her.

Matt is a young man kidnapped alongside his girlfriend from a bar. Held captive in a bayou basement, he exhibits combativeness and a desperate drive to protect himself and his partner, despite being severely injured by his captor.

Richard is Wren's supportive husband who worries about the heavy toll her job takes on her well-being. He tries to ground her and encourages her to maintain boundaries between her professional duties and her personal life.

Andrew is a prominent New Orleans chef and John Leroux's boyfriend. He serves as an essential source of comfort and normalcy for the detective, offering reassurance when the stress of the murder investigations threatens to overwhelm him.

Corey is a data entry worker who shares an office with Jeremy. Blasé and somewhat disrespectful when discussing the local missing persons cases, his casual workplace banter inadvertently provides Jeremy with a cover of normalcy.

Martine is a fortune teller in New Orleans who conducts an unsettling tarot reading. Her ominous warnings about betrayal, hidden secrets, and imminent danger deeply rattle her clients.

Lindsey is part of a tight-knit friend group that helps bring levity to intense professional lives. Her birthday celebration initiates a fateful visit to a local fortune teller that sets off a chain of unsettling realizations.