Nash, while investigating an apparent gang killing, discovers that the weapon used for the job is the Army's newly missing man-portable, antitank system: The Javelin. Nash is assisted in the investigation by Sandra McCormick whoose career is on the line if the Javelin is not recovered.

On the day that Nash plans to take a belated honeymoon to Hawaii with Kelly, a high priority police case unravels, putting him on the trail of the betting book of San Francisco's most notorious bookie and a renegade FBI officer who's #9 on the Most Wanted List.

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.