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.