MI-5: Vol. 5

Known across the pond under its original title, "Spooks," this British espionage drama follows a covert team of MI-5 officers tasked with protecting the world from terrorist threats. In the wake of a fourth-season stunner that found the team being held hostage by an ex-colleague with an ax to grind, the show's fifth season unfolds with a series of terrorist attacks that prompts the government to tighten national security.