I was lent 'The Walking Dead' volumes 1-3, graphic novels by Robert Kirkman. These too, are incredible, in a downbeat way.
Thing is, neither of these items are depressing as such. They just both evoke the kind of introspective, self-questioning mood that makes me view everything I do or have ever done as pointless, and everything I ever enjoyed as selfish.
Think I'll go and watch 'Lawn Dogs'. That'll fit right in.