This episode occurs as "a 24 hour day in the life of the SIU" with the day being Christmas Eve. This premise immediately restricts the latitude of action (how many shoot-outs or action sequences can Nash and company encounter in a day?). Once the premise of the investigation of the department store robbery is established, almost all the action is focused in the headquarters of the SIU. The fact that headquarters is now a boat is made clear when Angel (Nash's wacky self-professed guardian) leaps off of the roof of the boat into the chilly waters of San Francisco Bay.
Even Nash doesn't move around much in this episode to show off the locations of San Francisco. With his car stolen, Nash is forced to stay put as Joe frantically tries to locate the 'Cuda. The other members of the SIU also stick around the station. Evan Cortez (remember how squeaky clean Evan used to be in the first season?) is now a sleazy, horny creep who finds out that his hot college date is a hooker. Harvey Leek gets dumped by his wife, so Harvey gets drunk and passes out in front of everybody at the station. Bryn Carson spends the night in the holding cell disguised as a hooker. What's going on here? Hookers are everywhere. Everybody has an uncomfortable, sexually horrible Christmas except Nash.
Nash finally kisses his beautiful new romantic interest, nurse Whitney Thomas. With that second wife totally out of the picture (remember Kelly?) the gap is being filled by nurse Whitney Thomas. First wife Lisa is still in the wings, being the brunt of a potentially cruel mix-up of romantic gifts, with Lisa receiving the gift meant for Whitney. Nash's romantic life continues to be complicated with two women, the two now being Lisa and Whitney. If they bring back Kelly, things will really get complicated. The episode ends with a performance by Joe (can Cheech really sing?) and Big Barry (musician Clarence Clemons on the sax) for a group of kids.
For more, see synopsis for Episode 20