The Big Apple is well-known not only for eclectic communitites but also for its nightlife. No matter what somebody wants to do, chances are, it can be found somewhere. In a Tribeca club, for example, one may find a party for the release of a new vodka. Since the alcohol is of "ice" variety, the club is chilled and people wear gloves to pour. After the 'new face' of the campaign is discovered dead and bleeding profusely on a hydraulic platform, NYPD is called in to mop up the mess.
When Det. Mac Taylor (Gary Sinise) arrives, Det. Lindsay Monroe (Anna Belknap) is taking pictures of the crime scene. They figure out the weapon was never removed from the body. What's bizarre is it is not in the body, either. Mac looks around and realizes it was probably an icicle. The evidence team has one hour to obtain evidence. Det. Danny Messer (Carmine Giovinazzo) arrives just as Mac gets a call about another scene. He leaves them, instructing the team to keep him updated.
As Danny and Lindsay continue their work, he mentions she stood him up. She apologizes, which leads him to ask if things are okay between them. She says yes. They examine the platform and find feathers lying around. These are not part of the victim's costume. When witnesses are questioned, they find nobody left the club after the victim was discovered.
In Central Park, Det. Stella Bonasera (Melina Kanakaredes) and Dr. Sheldon Hawkes (Harper Hill) are helping Mac process the scene of a man who died while running the New York Marathon. Aloud, Mac wonders how death could have happened in front of thousands of people. It dawns on him water may be the culprit. Quickly, he stops any more from being given out. Prints will not be available easily, since all volunteers wore gloves. However, a high pressure valve was found. This may be exactly what they need.
Dr. Sid Hammerback (Robert Joy) tells Mac the death is not natural. He also ran a toxicology test, which turned up negative for cyanide poison. This contradicts what Hawkes originally thought. Also, despite ninety degree weather, the victim had traces of frostbite. Mac suggests other substances produce the same effect.
Together, Sid and Hawkes do additional analysis, and find fish eggs on the victim's shirt. Strange...
Back in the morgue, Sid tells Danny and Lindsay their victim was 'stone cold sober' when she died. Danny makes one of his smart remarks, which Sid ignores. However, it's clear the comment was offensive. Sid's testing shows alcohol entered the victim's body at death or immediately afterwards.
In one of the lab rooms, Mac, Stella, and Hawkes decide the valve was the murder weapon. It forced carbon monoxide in the face of the dead runner. Since carbon monoxiode is a gas, the pressure would have forced him to inhale. Mac notices Stella appears distracted and asks if she is 'still with us'. This is not the first time this has happened, but distraction made sense when Stella was recovering from killing her boyfriend in "All Access".