What if the UK’s MI5 was run not by sleek secret agents, but rather, a bunch of second-rate, hand-me-down spies? Slow Horses gives us a taste of that as it centers on Slough House, a division of MI5 that serves as a detention center for their smart but hopelessly damaged goods. In this six-part miniseries, the Slough House agents reluctantly exchange their humdrum duties for a big and unexpected case. Led by the eccentric Jackson Lamb (a very funny and effective Gary Oldman), they track a group of Right-wing terrorists and their hostage before it’s too late. With its brisk pace, endearingly bumbling characters, and deft balance of suspense and humor, Slow Horses might just be one of the finest thrillers out there.