Its not a twists and turns thriller type show.
But if you appreciate quality TV that focuses on realism and have a bit of patience, I think you'll enjoy it a lot. It starts off slow but the story unfolds like a high caliber novel. All I can tell you is that I don't think I can truly enjoy another cop show after having watched this, I'm spoiled! I've never watched a show that was so consistently brilliant throughout. And this is after I've just watched all the seasons of Dexter. Once I got to know the characters pretty well, I went through so many emotions during my watching experience. All 5 seasons are ridiculously good, in fact I can't pick a single season as my favorite.