Warning: Contains SPOILERS for Slow Horses season 4, episode 1Slow Horses season 4, episode 1, “Identity Theft,” has viewers wondering what really happened to River Cartwright (Jack Lowden). Although River has been working for Slough House head Jackson Lamb (Gary Oldman) for three seasons, he still isn’t a veteran MI5 operative not by a long shot. However, one of Slow Horses‘ cast of characters who is is his grandfather, David Cartwright (Jonathan Pryce). David, who raised and supported him since childhood, is a legendary MI5 agent, having been a major player in the service. Previously, David even opted to destroy the incriminating “Footprint” file, putting MI5’s reputation first.
https://screenrant.com/what-happened-to-river-cartwright-in-slow-horses-season-4/
