Spoilers for Slow Horses season-four finale “Hello Goodbye” follow.
It’s baffling that more TV series have not adopted the Slow Horses model of storytelling. Years ago, when cable platforms and premium channels first started distinguishing themselves from the 22-episode network season, the Slow Horses structure seemed like the future of TV. It uses shortish self-contained seasons that draw out multiple plot threads, and eventually they all collide into a catastrophic wallop.