NCIS: Los Angeles' season 6 hunt for the mole will kick off in episode 9.

Who Will Frame Sam On 'NCIS: LA'? Chris O'Donnell Previews 'SEAL Hunter'

Back in episode 3, Director Vance informed Hetty that there was a leak in her operations. While the Office of Special Projects has yet to take any action against this purported breach, the upcoming episode, which Spoiler TV reports is titled "Traitor," will see the team start to flush their nemesis out.

Filmed as episode 607, "Traitor" was directed by Eric Pot ("Windfall," "Resurrection").

Will Nell Save The Day On 'NCIS: LA'? Action-Packed 'Leipei' Takes On Drone Attacks

"Concept meeting for E607," tweeted executive producer John Peter Kousakis in late September. "[Eric] Pot directing. The mystery begins. #jpkteaser searching 4 the mole. #NCISLA #staytuned."

In the meantime, Callen, Deeks, and Kensi must work to clear Sam's name in "SEAL Hunter" while Nell tries to stop a Long Beach drone attack in "Leipei." "The Grey Man" will precede "Traitor."

Find out more when NCIS: LA airs Mondays at 10 p.m. ET on CBS. Click the video below to see a sneak peek for the series' next episode, "SEAL Hunter."

Tags: NCIS: LA NCIS: Los Angeles television CBS