#NCISLA: Is Hetty secretly working with Anna following her mystery ...

NCIS: Los Angeles trailer for 'A Fait Accompli'

For the majority of NCIS: Los Angeles season 12 so far, Callen (played by Chris O’Donnell) and Anna’s (Bar Paly) romance appeared to be flourishing, with the two seemingly ready to take their relationship to the next level. CBS viewers saw Callen ready to pop the big question to his other half, even seeking the blessing of her father and his close pal Arkady (Vyto Ruginis), but didn’t get the chance when he discovered Anna had disappeared, with her lying to him about her whereabouts. But could Hetty Lange (Linda Hunt) be responsible for Anna vanishing?

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The revelation and spanner in the works for Callen and Anna’s relationship came in the closing moments of episode nine, titled A Fait Accompli.

Under the impression his girlfriend was taking part in some humanitarian work and helping a town devastated by wildfires, Callen headed to where Anna was supposedly staying to get down on one knee.

However, he was left perplexed and fearing the worst when the motel where Anna was supposed to be staying informed the agent she was nowhere to be seen and hadn’t stayed there.

The clerk on shift told Callen “nobody” had arrived to help out with the reparations, bluntly putting it: “I don’t know who’s been lying to you, man.”

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READ MORE: NCIS LA fans puzzled as Nell Jones missing from series again

NCIS LA: Is Anna secretly working with Hetty?NCIS LA: Is Anna secretly working with Hetty? (Image: GETTY/CBS)

NCIS LA: Callen and Anna's romance has taken a turnNCIS LA: Callen and Anna's romance has taken a turn (Image: GETTY/CBS)

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So where is Anna and why would she lie to Callen about her whereabouts?

Well, some fans are tipping the truth to lie with Hetty - another NCIS: LA regular whose whereabouts have been shrouded in mystery throughout the series so far.

Only popping up on-screen in the team’s HQ via video link, Hetty appears to be in some sort of war zone on a dangerous and highly-secretive mission.

She has been able to deliver some good news in season 12, however, helping Marty Deeks (Eric Christian Olsen) land a full-time role with the OSP.

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