The Slow Horses season 2, episode 5 recap includes the revelation that Alex Trooper (Catherine McCormack) is a sleeper agent, Jackson Lamb (Gary Oldman) discovering who has been targeting his agents, and an exciting shootout to end the penultimate episode of Slow Horses season 2. In season 2 of Slow Horses, sometimes referred to by the subheading Dead Lions, forgotten Cold War plots begin to thaw and bring chaos to Lamb and his team of agents at Slough House and MI5 in London. Russian sleeper cells threaten to destroy everything in Slow Horses season 2, episode 5, "Boardroom Politics".
https://screenrant.com/slow-horses-season-2-episode-5-recap/