Luther, Series 4

DCI John Luther:
I think he's this clever, little lonely man, slowly falling apart, spending his days watching the lives of others. And you know what that's like... other people's lives seem so much better than ours. More interesting, more attractive, more alive. The way he sees it, they got something that he needs, so he's just going to take it from them. No, he's never going to stop, he's just going to keep doing it and doing it, because he'll never get back whatever he's lost. None of us ever do.