Luther 3x2 -

The investigation leads to William Carney, an aging serial killer in a care home. Luther discovers Carney has been mentored by a "pilgrim," Paul Ellis, who is carrying out the new murders.

( Ned Dennehy ): The disturbing original "Creeper" providing guidance to the new killer. Luther 3x2

(Sienna Guillory): A potential love interest for Luther. The investigation leads to William Carney, an aging

Luther’s chilling interview with William Carney reveals the killer's motives and the connection to the cold case. The investigation leads to William Carney

(David O'Hara): The IA officer determined to dismantle Luther’s career. Guide to Key Scenes

In a pivotal moment, Luther listens to Ripley’s recorded statement and realizes his partner defended him despite the pressure from IA.