" Here's the thing about killers. If you know one, I'm sure you'll agree with me:
They can't help bragging about what they've done.
Seriously. They are totally vain. And that, generally, is their undoing.
Look at it from their point of view: I mean, here they are, and they've gotten away with this terrific crime. You know, something totally ingenious that no one would ever think to pin on them.
And they can't tell anybody. They can't tell a soul.
That's what gets them almost every time. Not telling anyone - not letting anyone in on their brilliant secret -well, that just about kills them.
Don't get me wrong. They don't want to get caught. They just want somebody to appreciate the brilliance of this thing they've done. Yes, it was a heinous - sometimes even unthinkable - crime. But look. Look. They did it without getting caught. They fooled the police. They fooled everybody. They have to tell somebody. They have to. Otherwise, what's the point?
This is just a personal observation, of course. I have met quite a few killers in my line of work, and this is one thing they all seem to have in common. Only the ones who kept their mouths shut were the ones who managed to keep from getting caught. Everybody else? Slammer city. "

― , Reunion (The Mediator, #3)