Cast of Mr. Mercedes

Brendan Gleeson portrays Detective Bill Hodges, the retired police detective haunted by an unsolved case. Hodges becomes obsessed with capturing Brady Hartsfield, a mass murderer who torments him through a series of disturbing letters.

Harry Treadaway takes on the role of Brady Hartsfield, a disturbed and manipulative young man who commits a horrifying act of violence and successfully evades capture. He later engages in a cat-and-mouse game with Detective Hodges, taunting him with his plans for more destruction.

Kelly Lynch plays Deborah Hartsfield, Brady's mother. She has a complex relationship with her son and struggles to come to terms with his dark and twisted nature, while also concealing her own secrets.

Jharrel Jerome portrays Jerome Robinson, a young man who becomes a friend and ally to Detective Hodges. He assists Hodges in his investigation into the Mercedes Killer and provides a fresh perspective on the case.

Mary-Louise Parker takes on the role of Janey Patterson, a wealthy widow who becomes romantically involved with Detective Hodges. Janey provides emotional support and stability to Hodges as he becomes consumed by his pursuit of Brady Hartsfield.

Holland Taylor plays Ida Silver, a no-nonsense woman who becomes acquainted with Detective Hodges and assists him in his pursuit of justice. She provides him with valuable information and resources to aid in his investigation.

Breeda Wool portrays Lou Linklatter, a mentally troubled woman who becomes a victim of Brady Hartsfield's sinister mind games. She is entangled in the dangerous web Brady weaves and must find the strength to confront her past.

Justine Lupe takes on the role of Holly Gibney, an intelligent and socially awkward woman with a unique set of skills. Holly joins forces with Detective Hodges and Jerome Robinson, using her expertise to help track down Brady Hartsfield and end his reign of terror.