Did Callen and Sam find the person who murdered an engineer who was developing a guided missile destroyer?
That was addressed on NCIS: Los Angeles Season 8 Episode 19 when the duo went undercover to track his co-worker aboard a plane to Tokyo.
The pair was shocked when the co-worker tried to sell the intel aboard the plane, but did they manage to arrest the villain before it was too late?
Meanwhile, Deeks planned a surprise get-together for Kensi and her out-of-town friends.
Use the video above to watch NCIS: Los Angeles online to get caught up on the latest drama for the characters.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.