The plot synopsis for Season 12, Episode 7 has also been revealed and it reads as follows:
“The NCIS team’s murder investigation of a man who sold military information leads to the abduction of a doctor whose cutting edge neurotechnology could be developed into advanced weaponry.
Also, team members are interviewed by FLETC to see if Deeks would make a good NCIS agent, and Callen tries to have an important talk with Arkady, on NCIS: LOS ANGELES.”
It will be important for fans to watch (or maybe re-watch) the fall finale before the NCIS: LA winter premiere airs in January.
As hinted at in the episode description, we are also going to see the return of Arkady Kolcheck (played by Vyto Ruginis again).