It's Christmas Eve, and Nash and his fellow cops are trapped at the SIU as they wrap up a murder investigation and a prostitution case. Joe borrows Nash's 'Cuda to get it detailed and freaks out when the car is stolen; Nash's personal gifts to Lisa and Whitney get mixed-up; personal crises abound as the cops deal with the Christmas holiday.

Joe goes under cover as a prisoner to find out what is happening with a drug cartel leader who has had a friend of Nash and Joe's murdered and is up to more. Stacey tries to get Nick's Will in order with her, Nick and Nash.