Adam is very interesting character. I think i prefered season 1 and 2 because there were extremely important questions raised and the way Tom's soul was opened to us. My favourite ever author is Dostoevsky and i just so partial when thing in the books and films turn out to be what i consider Dostoyevsky way and something in the Spooks 1 and 2 was that way - never simple, tragic and grim. I felt less of it and more of "spy story" in the seasons 3 and 4.