The penultimate episode of any thriller series is always a great place to take stock. Slow Horses' “Grave Danger” mirrors the second-to-last episodes of the past seasons – crucial exposition, stakes dialed up to maximum voltage, and a full shift to
Slow Horses Season 4 continues to deliver solid, dependable, gets-the-job-done-and-then-some in the opening episodes, which hit its marks with assured precision.
The Slow Horses "companion series" Down Cemetery Road, starring Emma Thompson and Ruth Wilson, adds ten more actors to the roster, filling out the cast.