German episode title: "Finale".
Brenda Vaccaro doesn't appear in this episode.
The show was abrupty cancelled mid-season due to low ratings. In the final scene, viewers learned that Grant's wife Marjorie's plane had gone down. TV Guide reported that before its cancellation, the producers were thinking of adding film star Loretta Young to the cast as Grant's sister-in-law, so the likely scenario would have been that Marjorie died and her sister comes to town.