Did the team manage to prove a notorious dirt bike gang were to blame for a marine's murder?
That was a key question on NCIS Season 14 Episode 21 when it became apparent some people were trying to cover the crime up.
Things took an interesting turn when it emerged that the marine joined the gang undercover for a year before he died.
With leads dying out, did the team find out the truth?
Use the video above to watch NCIS online to get caught up with the latest drama for the characters.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.