For series fans, volume 3 offers a staggering amount of supplemental features on the season, its performers, and the creative forces behind the show. Featurettes on the directors of each episode are included, as are interviews with cast members on their careers and characters, and series creator David Wolstencroft, who discusses the program with other writers from the program. Ten minutes of deleted scenes, a gallery of images from the season, and commentary on each episode (from producer Andrew Woodhead, director Johnny Campbell, executive producer Simon Crawford Collins, and cast member David Oyelowo, among others) round out the extras. Oh, and if you can't wait to find out what happens in season 4, there's five minutes of speculation from the cast and crew. And like all good spy stories, you'll just have to wait and see who's telling the truth. -- Paul Gaita