Denise Hemphill: This is what I learned at Quantico and by watching movies about Quantico -- ooh! -- and from the hit TV show Quantico, now in its thrilling second season. Here's the thing: If you wanna catch a killer, you got to get inside the mind of a killer. Or, in Zayday's case, underneath the weave of a killer. And I know just the right person who can help us do it.