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Currently you are able to watch "Slow Horses - Season 4" streaming on Apple TV Plus, Apple TV Plus Amazon Channel.
After disastrous leaks forced Ingrid Tearney to resign, the MI5 is now led by the ambitious Taverner. But her new role is not everything she thinks it is and the repercussions from the leaks are not fully over. Meanwhile, River and his grandfather David face a reckoning as their relationship changes. In the midst of all the personal drama, a bomb goes off in London forcing both MI5 and Slough House to investigate.