The Plot Organic

I've been giving this a lot of thought lately, the organic plot. How do we keep the plot organic to the character?

Have you ever read a book and there's a twist thrown in just for the shock factor and it doesn't feel right? Or you discover something about a character that is only revealed because of the plot--and it feels like the writer put it in just to justify an action?

I've quit reading books when this happens. I was a huge Alex Cross fan in the beginning. And then James Patterson turned F...