- The team discovers that a man who shot and killed a married couple is actually a victim of "Dr. Jekyll," and Dr. Langston could be the doctor's next target.
- Tom Layman, his wife and the family dog are shot dead without motive, only young daughter Grace escaped by hiding. Their ex-con gardener is only guilty of a petty theft. A neighbor however seemingly went mad and is taken down by SWAT. His fury was actually manipulated by implanting radio-active pallets, custom-made for uncooperative surgeon William Byrne. The whole thing bares the 'poetic justice'-akin signature of the brilliantly deranged serial killer Dr. Jekyll. Following his trace proves physically dangerous.—KGF Vissers
- When the Layan couple and their dog are murdered by a man with a revolver, their young daughter Gracie survives the attack but does not recognize the intruder. The police and the CSI proceed in their investigation until they find that the killer was their next-door neighbor Jack Herson. They locate him, but he mysteriously dies. In the autopsy, Langston, David Phillips and Dr. Robbins find that the man was indeed another victim of Dr. Jekyll, who had implanted isotopes of Iridium into Jack's brain. Now the manhunt to catch Dr. Jekyll begins.—Claudio Carvalho, Rio de Janeiro, Brazil
- When the CSI team investigates the brutal murder of a family, they trace the killer to the house next door, which might belong to the "Dr. Jekyll" serial killer.—CBS Publicity
- "CSI" - "The Irradiator" - April 8, 2010
It's night in Vegas and a dog barks outside a home. A couple working on a crossword puzzle argue about whose turn it is to bring in the dog. The wife goes to get him and the husband hears a gunshot. He grabs a bat and runs as he hears his wife scream. We see her get shot and she says "what the hell's wrong with you, now you're really in trouble." She turns to walk away towards her husband and the shooter kills her.
The next morning the CSIs investigate, Catherine and Sara take pics. The husband and dog have also been shot. The couple's daughter appears to be missing. We see the shooter again from the night before shooting at the girl. She runs into her room.
Nick and Ray go into the girl's room which is disheveled. It wasn't a robbery. Nick says it looks like they came for the girl Gracie. The father was a pit boss, the mother a freelance writer. There's no blood on Gracie's bed. Nick finds a crawl trail on the carpet. They follow it to a storage window seat. The little girl is alive inside. She screams. Nick tries to comfort her. She cries in his arms.
The CSIs gather evidence. Greg takes photos of a tampered with windowsill. The shooter came in through the back door but think he might have done recon by the window first. They get a print.
At the lab Hodges collects trace from the wife's robe.
Wendy examines shards of something in the blood samples from the bloody shoeprint.
The print from the windowsill came from the gardener.
Nick goes to talk to Gracie in the hospital. He says her Aunt Maggie is coming in from Boston to see her. He asks for her help. He shows her a picture of the gardener and asks if he was the shooter. We see her relive him coming into her room. He destroys it but doesn't hurt her. She crawled to the windowseat hiding place. She says it was too dark to see anything. She apologizes. Nick says she's safe now and asks again. She says it was him and then asks "right?" Nick smiles at her.
In interrogation with Brass the gardener, who used to be in a gang, says he simply leaned against the window and sometimes he just hangs out with the old homies but he no longer runs with those guys. He's been straight for nine years and has a wife and kid. He does, however, match the shoe imprint. He says he was never in the house. Brass asks if he's sure. He admits he snuck in the window last week and stole the daughter's video game box. He gripes about his pay but says he didn't kill anyone.
They test his shoes but there's no match according to Hodges. Sara says they haven't had any luck with the bullets either. Hodges tells her the dust on the killer's shoe print was titanium and maybe they're looking for an industrial worker.
Nick and Sara go to look for traces of the dust at the scene. The trail leads them to the next door neighbor's house. There's a blood smear on the doorknob. The door is unlocked. They announce themselves and call for back up and head in. No one appears to be home but they find .22 shells on an office desk like those the husband and wife were killed with. They advance further into the house and find a sink overflowing in the cellar. They go further down and discover a machine running that looks like it has a drillbit working in shards of metal. Music is playing. Sara finds a workshirt with blood spatter on it.
We see a news clip of an anchorwoman saying the police are looking for retired machinist Jack Herson as a person of interest in the murders. A neighbor talks about Herson hating the disruptive dog and that his antics would drive anybody to murder.
The CSIs investigate his home. He was a skilled machinist in the aerospace industry. Ray tells Sara that Herson's revolver is probably the murder weapon. No sign of it. They've gone through his email and credit cards and have no leads on his whereabouts. They hypothesize since he was deeply in debt he finally snapped one day under the pressure. On his desk Ray finds something very interesting to him. A surgical tool.
They get lucky, Herson was involved in a hit and run. Brass is running him down.
Ray lays out the surgical tools for Nick and Sara and explains that these particular ones are for neurosurgery. Nick thinks that Ray thinks that Herson is Dr. Jekyll. Sara wonders why a methodical killer would sloppily kill his neighbors. Maybe they found out? Nick points out the potential "operating table" nearby. They spray it and discover blood trace. A lot of it.
At the lab Greg tells Sara that they found Herson's car overheated at the side of the road. They reason, from a photo in his house, that he might be going to see a woman in Pahrump. They go there and surround the house, surveil it so they can hear him, and tell him to come out. He's raving about the barking dog to the woman, who is his aunt. Brass wonders why he's so freaked.Herson is holding a gun on his aunt and raving that there is something wrong with his head.
As Ray and Nick leave Herson's house they notice his radiator cap is missing. They note that when Jekyll does his operations he takes a souvenir and leaves behind a momento, they find one in the radiator, a piece of paper that read "Gita 11.32."
Brass asks him to let his aunt come out. Herson kills his aunt. And the cops move in. Herson staggers up the stairs, sweating and foaming at the mouth and collapses. And dies.
Ray enters the info into a search engine. It's a passage from the "Bhagavad Gita" "now I am becoming death, the destroyer of worlds." They realize Herson isn't Jekyll, he's another victim.
They recap Jekyll's murders, souvenirs, and mementos. They wonder what Jekyll took in return for Herson's radiator plug. They pull off Herson's toupee and see fresh scars on his head. They take a scan of his skull and inside there is something radioactive.
Robbins, in a hazmat suit saws off Herson's skull to get the radioactive seeds Jekyll put in there with surgery and a straw. The seeds change behavior patterns with regards to sex and aggression. They posit that after dosing him with ketamine to do the surgery Herson might not have even known what happened after he came to and was likely unaware of what he was doing when he killed his neighbors. He had called his HMO complaining of headaches, couldn't get an appointment, and was driven crazy by the dog barking. Gracie being spared was his last shred of humanity. They figure Jekyll hired Herson to make the surgical tools and then when he was done he turned around used them on him, which Sara calls severely twisted. Ray calls him a classic sadist who likes slow agonizing deaths. Catherine says Herson's emails may help lead them to Jekyll. And Robbins points out they might be able to trace the radioactive seeds somehow.
Hodges figures out what the seeds are- they are used in cancer therapy- and when and where they were made and who they were delivered to, a doctor at a local hospital.
Ray and Brass go to talk to the doctor, who says they did receive the seeds and some are in fact missing. The doctor asks if he and Ray have met. He says they haven't. The doctor asks what's up with them checking up on their missing seeds. Ray explains. The doctor is freaked. Brass asks for his whereabouts the last few days. He wonders if he's a suspect. Brass says they're trying to rule him out. The doctor says to check with his secretary and then realizes who Ray is, he read his book and read at as an indictment of the medical profession and surgeons in general and that Ray would love it if he were Dr. Jekyll so he could write a sequel about another psychopathic doctor. Ray says the doctor didn't read with much comprehension since the book really examined Ray's own failures. The doctor continues to get snippy with him and basically says Ray obviously couldn't cut it as a real doctor which is why he became a CSI. Ray literally knocks his head into a wall. The doctor says Ray now has a problem. Brass looks both distressed and a little impressed.
Brass catches up with Ray and says the doctor has agreed not to press assault charges, especially given the "loss" of the radioactive seeds and how that might look. Brass advises not to take his frustrations either about Jekyll or some old, unfinished business out on other people because that won't work for him.
Nick looks at the hospital's video trying to figure out who stole the seeds. One person who entered the restricted area at the time the seeds went missing was an impostor using a vacationing doctor's code. It turns out that he's in the building right now. Nick and Ray spring into action looking for him and tell security to lock down the building. Ray spots him and takes off after him with both knocking over patients and IVs and gear along the way. Ray chases him to a stairwell but doesn't know if he went up or down. He banks on down and starts heading that way. He goes onto a patient floor and creeps along. He passes room with a body under a blanket and then realizes that must have been him. He goes back and the body is gone. He runs through the kitchen after him and calls Nick.
Nick and Ray chase from opposite corners. Ray enters a room filled with storage cages. (And atmospherically leaking steam pipes.) He turns around and is brained in the face with a pipe. Dr. Jekyll leans over his body and grabs his CSI ID and walks away. He breaks into a run when he hears sirens. Ray passes out.
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