" There are, of course, the people who revolve around themselves--but I agree with you, she's not one of that kind. She's totally uninterested in herself. And yet she's got a strong character--there must be something. I thought at first it was her art--but it isn't. I've never met anyone so detached from life. That's dangerous.'
'Dangerous? What do you mean?'
'Well, you see--it must mean an obsession of some kind, and obsessions are always dangerous. "

― Agatha Christie , The Mysterious Mr. Quin (Harley Quin)