Why do we take pleasure in gruesome death, neatly packaged as a puzzle to which we may find a satisfactory solution through clues - or if we are not clever enough, have it revealed by the all-powerful tale-teller at the end of the book? It is something to do with being reduced to, and comforted by, playing by the rules.
I have never been able to read Agatha Christie - the pleasure is purely in the puzzle, and the reader is toyed with by someone who didn't decide herself who the killer was until the end of the writing.
I just consider myself a piece of the puzzle and I'm lucky enough to be asked or invited to the party, if you will. I hope I can bring some laughs and grimaces to the fans.
To diagnose and treat a brain disorder accurately, it would be necessary to look at the brain directly. Looking at behavior alone can miss a vital piece of the puzzle and provide an incomplete, or even a misleading, picture of the child's problems.
I'm not a great student, so I don't know that I would have been a great detective. Part of my brain sort of works that way, like wanting to figure out puzzles and figure out what happened and why people do the things they do and who they are and how it happened.