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.