The show is being presented over three weeks, with two 1-hour episodes a night. And it's terrific. Smart, well-acted, low-key, beautifully written and gorgeously shot. (No pun intended on that "shot" thing...) Quite a few good twists-and-turns, as well.
It airs on Wednesdays, so if you missed the first two episodes, you can probably catch a re-airing before then on TNT. Or it might be On Demand, or on the TNT website. If you like this sort of story -- or are mildly interested, it well-worth your time.