Although Slow Horses season 4 has only just started, work is already underway on the upcoming fifth season of the beloved yet underseen spy series, which is one of the best TV shows of recent years.
The thriller show was renewed for season 5 back in January, months ahead of the fourth chapter's debut. That's hardly a surprise though given how acclaimed it is by fans and critics alike, widely considered one of the best Apple TV Plus shows. In fact, our Slow Horses season 4 review says that it "is showing no signs of slowing down, delivering yet another charming and compelling season".
