" Well, all those are just things, aren’t they? Possessions or activities. Things we do, things we care about. But there’s something behind them all that ties them all together into my life, who I am, what I am. With Keith, you never knew. He was a cipher. For example, I’m sure he loved his family, but he never really showed it or spoke much about it. I don’t know what really mattered to him. He never talked about hobbies or anything like that. I don’t know what he did in his spare time. It’s more than being private or secretive, it’s as if there was a dimension missing, a man with a hole in the middle. "

― Peter Robinson , Dry Bones that Dream (Inspector Banks, #7)