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Night. In a WLVU dorm room, Paula, 18, and Trip, 18, make out. Eventually, they migrate to the floor, on top of a sleeping bag, where they start to make love. After reaching climax, they fall asleep.
The next morning, Grissom, Sara, Greg and Brass stand outside the door. Brass shows the CSIs the dead bodies of Trip Wilmont and Paula Levine. Sara sees alcohol, a CD player, and candles--all elements to set the mood.
David Phillips notices that the victims are both slightly pink, which is a common side effect of carbon monoxide poisoning. They take a sample of the vomit next to Trip's head. Grissom is called away to another case.
Zack Capola, 18, and Susan Hemmington, 22, the dorm R.A., talk to Brass. Zack saw Susan knocking on Trip's door, so he used his pocket knife to "jam it open." This is a common way to enter dorm rooms, as the locks are not good. Zack was the nerd who helped out Trip, the jock. They were not friends.
Sara uses a CO detector and finds no trace of CO in the dorm room. Greg uses the ALS and finds that there's trace of semen on the door handle. The doorknob next door is covered in seminal fluid, the result of "trophy condoms." As Greg puts it, "When a stud scores, he announces his victory by putting the spoils on his neighbor's doorknob."
When Sara and Greg hear an explosion down the hall, they enter the bathroom to see that a toilet has exploded. Sara asks Greg to start processing the scene.
Detective Vartann finds Conrad Ecklie and asks him to help out on a homicide at the Tangiers, since all the other CSIs are booked. Ecklie reminds Vartann that he's the Assistant Lab Director, but agrees to process the scene.
In the Autopsy Room, Dr. Robbins and Sara stand in front of Trip and Paula's bodies. He tells her that cyanide can turn a body pink and not everyone can smell the presence of the poison, which smells like bitter almonds to those with the genetic ability to detect it. Hodges enters and announces that he has the ability and smells the stomach contents from both decedents. Hodges smells beer and cheese whiz, but no cyanide.
Ecklie shows up at the Tangiers's hotel parking lot and sees the dead body of a middle-aged man lying next to a Buick La Crosse. According to the rental car agreement they found, he's a James Billmeyer from New Jersey. There is a footprint in the puddle of blood by his head that belongs to an old woman, Mrs. Vivoldi, who called in the case. They ask for her shoes.
Ms. Levine, late 40s, Paula's mother, sits next to Mr. and Mrs. Wilmont, 40s. Sara tells Ms. Levine that there was no evidence of assault on Paula's body by Trip.
Catherine and Warrick walk through a grassy field and find David Phillips staring at a male lying face down in the middle of a crop circle. The victim is Kevin Staniland, 30, from Reno, and he wears a blindfold. Lividity is fixed, indicating that he died in the middle of the circle. But how did he get there?
Greg processes the exploded toilet and finds no evidence of explosive powders. Sara posits that it may be methane gas, but Greg tells her he checked out that possibility already and there is no methane in that region of the county.
In the Coroner's Office, David Phillips points out the fresh grass stains on the victim's knees and that his underpants are soaked in urine. The CSIs are surprised by the translucent head of a worm pushing its way out of Kevin Staniland's mouth. Nick says that it's a tapeworm and the vic must have eaten meat or fish with the tapeworm cyst. However, this is not the cause of death.
Mia tells Sara that the semen found on the victim's doorknob and the neighbor's doorknob are consistent with Trip's DNA. Greg enters the DNA Lab and tells the women that Trip's neighbor, Zack Capola, filed several grievances against Trip.
Dr. Robbins tells Catherine that Kevin Staniland's C.O.D. is cardiac arrhythmia, which is unusual for such a young man.
Zack Capola tells Sara and Greg that he filed grievances against Trip in confidence because Trip was a jock and would have had his whole basketball team on him if he found out. Zack admits that Trip was an "ass."
Dr. Robbins finds Conrad Ecklie in the morgue waiting for him. Robbins took a "personal hour." Ecklie asks about James Billmeyer, the man found at the Tangiers. Robbins tells him that even though there was "an abraded laceration to the right occipital scalp, penetrating the epithelium but not the galea," it's not what killed him.
Dr. Robbins opens a cooler drawer to reveal that it's empty. Billmeyer is gone. Ecklie walks off, telling Robbins to find him when he finds Billmeyer's body.
Ecklie interrogates David Phillips, who claims it is not his fault that Billmeyer's body disappeared. He processed the body and then put it into the cooler drawer. Ecklie tells Phillips to find the body or it will go on his record.
Dr. Robbins informs David Phillips that he's checked every mortuary and funeral home in the city, but no Billmeyer. They come to the conclusion that someone played "body-snatcher" and took this particular body for a reason.
The CSIs assume that the crop circle must have been caused by a helicopter. They are in the A/V Lab, where Archie Johnson shows them a radar image on a plasma screen. They find the location of a helicopter that held position directly over the area where the victim was found.
In the Tox Lab, Henry Andrews tells Sara that Trip and Paula were "blotto," but he wonders if they checked the scene for Carbon Dioxide as well as Carbon Monoxide. The CO2 levels in Trip's vomit were 8%, which is lethal.
Dr. Robbins and Detective Vartann go through James Billmeyer's personal effects and find an airline napkin with the name Jacinda Hendler and a phone number scrawled on it. It says, "Call me."
Conrad Ecklie and Detective Vartann question Jacinda, who tells them that they got "frisky" under a blanket on the plane. He was in town to party with high school friends in Seven Hills.
Sara and Greg move the loveseat away from the wall in Trip's room and find a hole that has been drilled into the wall, about a foot off the ground. Additionally, Greg finds Trip's sex journal with lists of "girls, dates, and details of his sexual activities."
Sara and Greg go next door to Zack Capola's room and find a hole in his wall. Zack claims he didn't know it was there. His room is now a crime scene.
Catherine approaches a helicopter pilot, Morgan Wendel, who preempts the conversation and tells her that she must be there about Kevin. He tells her that he'll tell her everything for immunity.
On a TV monitor, the CSIs watch a blindfolded Kevin as he is is taunted by a man, Tucker, in the helicopter that Morgan pilots. Tucker is trying to get Kevin to jump out of the helicopter without a parachute for a show called "Going All The Way." Tucker mentions that Kevin has already eaten raw meat, stuck his face in a beehive and that this is the next challenge. A terrified Kevin pees in his pants.
Tucker forces a screaming Kevin out the door. It is only four feet until he hits the ground, but he isn't moving. Tucker turns towards the camera and shouts, "Turn off the camera!"
In the Interrogation Room, Tucker sits next to his attorney as Catherine explains that Kevin thought he was being pushed out of a helicopter a thousand feet in the air. Tucker claims that Kevin signed a waiver, but Catherine counters that he left him lying there after he saw he wasn't moving. Nick points out that he scared Kevin to death. Tucker will be getting twenty-five to life.
Outside of CSI headquarters, Dr. Robbins and Conrad Ecklie find James Billmeyer's body sitting on a bench with a cigar in his mouth and a party hat on his head. Grissom appears, on recess from his court appearance, and tells Ecklie that they recently acquired tobacco exemplars.
Back at the WLVU dorms, Zack claims he doesn't know how the hole got in his room. Zack was in LA for four days visiting his boyfriend. When he got back, Susan Hemmington was banging on Trip's door and he helped her break into his room.
Zack has a burn on his finger that he got from picking up something on his floor when he got home. He tossed the "something" into the trash can, but it's missing.
Greg and Sara think of one chemical compound that can burn skin and disappear into thin air--dry ice, which also releases carbon dioxide as it sublimates.
The CSIs have gloves and oxygen masks on as they place 10-pound bars of dry ice next to the hole in Zack's room. Greg is in Trip's room and he measure the amount of CO2 with a detector. It takes thirty pounds of dry ice to reach saturation level. The bodies were pink because it was cold in the room as well.
In the Coroner's Office, Dr. Robbins notices that James Billmeyer's body smells like it's been sprayed with pine tree disinfectant to cover the stench. Billmeyer died of a heavy heart, Hypertensive Cardiovascular disease. He keeled over and hit his head on the pavement. He was taking Atenolol for his condition. There is also beer in his lungs.
In the CSI Garage, Neil Derigner sprays the party hat with ninhydrin and pulls four fingerprints. In the Trace Lab, Hodges processes the cigar and finds that it is consistent with the Perdomo Reserve brand, which was recently purchased by a man in Seven Hills. Neil Derringer enters and tells them that the prints he lifted from the party hat belong to Preston Hayburn, a paramedic.
In the CSI Lab, Greg shows Sara an old toilet into which he just placed a block of dry ice. In the dorm toilet, if someone flushed excess dry ice, then the ice would have released its gas in the pipes, causing the toilet to explode. The toilet in front of them explodes. Sara postulates that a science major would have access to large amounts of dry ice.
Sara and Greg interrogate Susan Hemmington and tell her that her name was in Trip's sex journal three times. She admits that she had sex with him. Sara also informs her that she checked out forty pounds of dry ice from the campus lab last week and her advisor said she needed only two pounds at most.
Susan was blown off by Trip and then later that day she went into Zack's room and drilled a hole. She returned that night and put blocks of ice next to the hole. Trip and Paula were passed out from the alcohol and the gas engulfed the room, killing them. Susan thought she used just enough to make Trip sick, not to kill him. She wanted him to miss his basketball game and he only slept on the floor when girls were over. He never had sex before a big game. Except for that night.
Charlie Jackson, overweight and in his mid-40s, answers the door in his upscale home. Ecklie and Vartann enter and see the remains of a poker party. Charlie tells the CSIs that he knows James died and he knows Preston Hayburn, the paramedic.
Charlie says that James was dying and he flew out for one last bash. They decided to throw a "dead man's party" and stole James from the morgue. At the party, they propped him up at the poker table and put a cigar in his mouth. They also poured beer into his mouth. Vartann arrests him for obstruction of justice and conspiracy to commit theft.
Dr. Robbins heads out of the morgue and stops himself. He heads back in and opens a drawer to reveal the body of James Billmeyer. Relieved, he closes it.