See Also: 'Admissions' Episode Guide

Party hard--or die trying.

According to CSI Files sources, "Admissions" begins on a dimly lit street at night. A taxi slows to a stop in front of an elite prep school on the Upper East Side. Is this our serial killer? Does he have another victim in the back of the cab?

No, we see that this isn't the case as the doors of the cab burst open and four teenagers in semi-formal attire spill out of the back. They head toward the school, laughing as a Mercedes pulls into a parking space. Lacey Pearlman, a beautiful 18-year-old girl, gets out of the driver's side. Her date, Jesse Carver, gets out of the car and slips a silver flask into the waistband of his pants, out of Lacey's sight.

Lacey and Jesse head toward the building: Nelson Academy High School. The end of the year dance is in progress, and the pair heads toward the gymnasium to join the other students. Music is blaring and strobe lights flash as Lacey and Jesse approach Robert Greggs, the guidance counselor. Mr Greggs stands next to a bowl full of keys, and he tells Lacey to drop hers in with the others. The school is still responsible for the students, even if they are about to graduate--they aren't done just yet.

Inside the gym, students are dancing as a DJ spins records from a raised platform next to a microphone. Lacey and Jesse join their friends, and we switch our attention to Natalie, a pretty girl sitting alone in the bleachers. She's not partying with the others, but as Lacey and Jesse walk by, she follows their progress with her eyes. Is she jealous of Lacey?

As the party goes on, Mr Greggs keeps an eye on everybody, making sure the wild dancing doesn't get too wild and the slow dancing doesn't get too personal. Students use their cell phones to capture the moment when the King and Queen are crowned on stage. Natalie is still sitting alone, and she declines when a shy boy asks her to dance.

The class president, Sarah Bell, gives a speech on stage. The students are still snapping pictures with their cell phones. Meanwhile, elsewhere in the school, Mr Greggs isn't enjoying the festivities. Instead, he's being attacked. He gets punched in the face and thrown across the room as students continue to cheer during Sarah's speech in the distance. As she gets to the end, so does Mr Greggs--he is thrown against a cabinet with a glass front, and the chemicals inside spill out on top of him as he ends up flat on the ground.

Stella takes pictures of the crime scene, and we see that they are in a science lab. The victim's face has been burned by acid, and he is pinned beneath what is left of the glass-front cabinet. Stella and Flack speak to students, and they all remember seeing the victim introduce Sarah Bell for her speech. That gives them a small time frame during which Mr Greggs could have been murdered--he died at some point between introducing Sarah Bell and the end of her speech, when his body was found. One of the students tells Stella that she took a picture of Mr Greggs on stage, and Stella asks to borrow her phone.

As Adam pieces together the moments before Mr Greggs' murder with cell phone pictures, the team must find out if anybody at the dance would have had a reason to want him dead. Things become more complicated when they learn that Natalie is actually the daughter of Deputy Inspector Stanton Gerrard (Carmen Argenziano), last seen in season three's "Comes Around". Does she have something to hide? And how are things going with the elusive serial killer we first saw in "Like Water for Murder"?

Please note that the above plot details have not been confirmed by CBS, Alliance Atlantis or Bruckheimer Films, and until such time you should treat this information as you would any other rumour. The above information comes from early script drafts and the details of the episodes are liable to change before the episodes are shown.

"Admissions" is expected to air April 30 on CBS.

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