Without giving away plot ruining spoilers, the squad figures out that their dealing with a serial killer(cold cases help them figure out that this wasn't a stranger snatch and grab like they originally thought)...The unsub spends 72 hours(about 3 days) with each victim before he/she kills them. So it ends up being a race against the clock episode, which makes it very exciting and drama filled, cause there's no time to waste.
They gotta figure out, The Who, how, what, why(youd rather not even wanna know the why... but the why could lead to The Who...so the cops gotta know why or speculate as to why) and then the where(once you know The Who, the where becomes a lot easier).
So the squad dives right in, and they Find a lot of these answers(partially anyway) out because they have a witness who got way....but without giving away spoilers....the victim is like 8 so she doesn't give them much of anything especially pertaining to the where, what, Who, why and how....and the mom cuts the interview short....so they gotta go back to the drawing board and pretty much start from scratch...
See, no spoilers... So go watch....
But as far as the episode, I love the race against the clock theme going on....and the speed, in which they have to move, in order to catch The unsub( cause to call him human just seems wrong) but the sad truth is there are people like him lurking around everywhere...
Anyways great episode. I love the mystery surrounding it. It's got like a cat and mouse feel to it. There another episode like this one too. I forget the season but the unsub leaves behind clues and hints on how to catch him. It's got that mysterious vibe, and leaving behind the whole "who done it" vibe in that episode too. I love when you don't know who the bad guy is, until the end...and during the show, they throw in the false leads....And Then pretty soon the whole audience is trying to figure out who really did it lol Yeah, Sometimes they make it too obvious but when it's done right, it's rewarding when you figure it, especially when the detectives in the show/movie were wrong...Anyways I'm way off topic lol great episode!