Slow Horses 4x2 A Stranger Comes to Town Season 4 Season 1 0 EpisodesSeason 2 0 EpisodesSeason 3 0 EpisodesSeason 4 6 Episodes Vidsrc 4x1 - Identity Theft 4x2 - A Stranger Comes to Town 4x3 - Penny for Your Thoughts 4x4 - Returns 4x5 - Grave Danger 4x6 - Hello Goodbye A naive agent makes a discovery about the Westacres bomber. Lamb suspects that David knows more than he's letting on.