In Season 3 of the series "Slow Horses," the plot unfolds based on the book "Real Tigers" by Mick Herron. The main characters once again are members of Jackson Lamb's team. This time, the heroes are drawn into a conspiracy that threatens not only the existence of Slough House but also the entire MI5 team. In the finale of the previous season, Jackson Lamb discovers the reasons behind the unexpected death of a former agent. Min and Louisa receive an offer that is very difficult to refuse. River prevents a presumed terrorist attack. Lamb and Kinski come face to face. Ho narrowly escapes becoming a victim of a killer from Russia.