Ep 16. Ephemera

In NCIS season 17 episode 16, titled "Ephemera," the team investigates the murder of a Navy officer who was killed while trying to help a stranded motorist. As they dig deeper into the case, they discover that the victim was a part of a team doing top-secret research on an advanced propulsion system. They realize that the victim may have stumbled onto something that put his life in danger.

With the help of Ducky, they learn that the victim's research had to do with a prototype boat that used a new type of propulsion system. Further investigation leads them to a retired Navy officer who was working as a contractor for the defense department. This retired officer claims that the victim's research was flawed and could have caused a catastrophic failure.

The case takes a surprising turn when the team discovers a link between the victim's research and an old case that Gibbs investigated years ago. They realize that the victim's research could have helped solve that case and identify the killer. As they zero in on the suspect, they learn that someone is trying to cover up the truth.

Meanwhile, Torres is struggling with his feelings for Bishop. He decides to take the plunge and tell her how he feels, but she doesn't react the way he had hoped. Bishop is torn between her own feelings for Torres and her loyalty to her husband, who is still missing in action. The tension between them continues to grow throughout the episode.

As the investigation deepens, the team realizes that the killer may have ties to a foreign government. With the help of Agent Ziva David, who makes a surprise appearance in the episode, they are able to trace the killer's movements and finally bring them to justice. The episode ends with a touching moment between Gibbs and Ziva, as they reminisce about old times and discuss the importance of family.

NCIS season 17 episode 16, "Ephemera," is a gripping episode that explores the themes of loyalty, betrayal, and the importance of family. The episode is full of twists and turns, and will keep viewers on the edge of their seats until the very end. With the help of special guest star Cote de Pablo, who reprises her role as Ziva David, the episode delivers a powerful and emotional moment that will leave fans of the series wanting more.