A man found dead in the snow with a price tag hanging from inside his stomach leads the CSIs to the annual Idiotarod race where young New Yorkers in creative costumes race decorated shopping carts from Brooklyn to Manhattan as if they were dog sleds. The rules of the Idiotarod race encourage teams to sabotage their enemies' carts, so once the cause of death of their victim is proven to be multiple blows to the head, Danny, Sheldon and Det. Angell work to determine if this fun annual challenge became too competitive for one team. Meanwhile, when a successful real estate agent is found dead inside a Manhattan brownstone by some young kids, Mac, Det. Flack, Lindsay and Stella investigate what appears to be a possible kidnapping turned deadly.