Spooks, under the name MI5 in North America is one of, if not the best dramatic series I've watched. They aren't afraid to do the unexpected. There are several times you'll say "wow, wasn't expecting that". It's not just a build up to the season finale like most North American dramas, it's throughout the season.
The recent House episode with the unexpected Kutner angle is the best comparison to what Spooks is like...except Spooks will do that sort of thing season opener, mid season, 3 episodes from the end, the season finale, anywhere.
Very well acted, written, and shot series. Highly recommend watching from season 1 on, well worth the DVD purchase.
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