The return of Grissom's nemesis marks not only one of the most intense episodes to date, but one of the best.
10
"Perfect"
First off, let me say that this was probably, the best overall episode to date since Grave Danger. Some of the things I believe truly make this episode special are: for the first time the Miniature Killer case takes up the whole episode and I believe that definetely helps the episode, essentially the entire cast gets screentime (which is a mighty task considering the size of the cast), there are plenty of twists that keeps up guessing till the very end, and there are several points of continuity (like the mention of Greg's Civil Suit, the mention of the Blue Paint Killer, and even an indirect mention of "A Bullet Ran Through It") are a nice treat for long time viewers. Now onto the episode.
When Grissom first opens the box, his reaction says it all: Arguably the most intelligent and elusive killer in CSI history has returned, after a person confessing to the murders blew his brains out right in front of him! With the other serial killer arcs, the tention is always much higher then your normal episode because you know the killer could strike at any time. This time, it's even more so, because Grissom discovers that DAY the victim (and her cat) are scheduled to die, so now they have to find who she is and where she is, before it's too late. Add in the message "You Were Wrong" written by the killer using the doll photos from the previous miniatures, and this is definetely the most chilling one yet.
Though it doesn't take long for the CSIs to find the victim's house and who she is, the intensity doesn't stop as the CSIs decide to leave a decoy to trick The Miniature Killer. Almost right on time, a supicious man goes to the very room where the decoy woman is waiting, and while common sense tells us that The Miniature Killer would never fall for such a trap, it's still very edge-of-your-seat exciting when they make the arrest. Unfortunetely, the man is only the woman's brother, coming up to check up on her. They continue with the decoy, until it is very late at night and decide to call it off. At the same time, Grissom makes the discovery that the plants are to wilt at the time the woman dies, meaning something in the air must have killed her, but it is too late, as Sophia tells the decoy to come out, only to find her dead as a stone! This twist I thought was incredibly shocking and had me saying "Holy ****" at the TV. As Grissom discovers (via tiny lunges in the miniature victim), the officer died by carbon monoxide poisoning. They also find a device that was set to go off and send charcoals into the fire, releasing CO into the air. This made me think, while at first I believed the killer must have been someone very close to Grissom to know he'd go on Sabbatical. However, since the means of killing meant the Miniature Killer didn't even have to lay a finger on the victim, even if Grissom hadn't gone on Sabbatical and opened it a month ago, the result would have been the same.
Afterwards, after Sophia comes to see Grissom and talks about the killing of the undercover officer (which reminded me of "A Bullet Ran Through It"), Grissom comments that he believes that since the intended victim is not dead, the crime scene is not "perfect enough". Right on cue, Grissom recieves a call and says "Now it's perfect." While processing the scene for the second time, Catherine notices that there is one drop of liquid in the victim's ear. At the autopsy, Doc. Robbins finds that the victim was suffering from severe Parkenson's Disease, and that the liquid is a tear. The DNA inside the tear is revealed to be that of her brother, who decided that he would kill her instead of seeing her suffer, and blame the death on The Miniature Killer. The twist is both shocking and sad, since we know the brother, who was trying to save his sister from torment, will go to jail. Also, while the The Miniature Killer did not kill her, the result is the same: the intended victim died, and the miniature is now perfect.
At the end of the episode, we see Grissom and Sara going over the tapes of Ernie Dell's (the guy who took blame for the murders) home movies because they found out that Ernie Dell had many foster kids who he would shoot himself to protect. Unfortunetely, tracking the literally dozens of foster would be virtually impossible, leading to another dead end. Grissom ends the episode with a great line: "Eeenie, Meenie, Minie, Moe. Catch a monster by the toe".
I've noticed that some people believe that Sara could possibly be the Miniature Killer, and the young girl in the home movie is Sara. I noticed that they show a almost slow-mo show of her, possibly meaning she will be very important. I don't want to say that she IS the killer (or the girl for that matter), but it would be one amazing twist to end an amazing story arc.