Jin seeks justice after a death rattles the group. Investigators learn of an extremist group devoted to an otherworldly entity ahead of a major summit.

Taverner and the Slow Horses attempt different approaches to locate the kidnappers and Hassan. Ho makes a shocking discovery about Sid. ref: https://seasondate.org/en/serials/2022-slow-horses

Slough House is the unlikely venue for a secret romance, but events take a dark turn when a dangerous encounter becomes deadly.