In this scene from the premiere of Slow Horses Season 4, Jackson Lamb arrives to tell his longtime friend and colleague Catherine Standish the sad news about River Cartwright. But he has a little more up his sleeve than just a box of Jaffa cakes. See how the tense and darkly funny scene transformed from script to screen in this behind-the-scenes look at Slow Horses. Slow Horses — Now Streaming #SlowHorses #AppleTV #AppleTVPlus | Apple TV