NCIS: Los Angeles will send Kensi back into the field during "Three Hearts," and the agent will have work out her relationship with her partner as they take on the world of smuggling.

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Deeks (Eric Christian Olsen) and Kensi's (Daniela Ruah) personal drama will play out against an investigation into one of NCIS' own. Paul Angelo (guest star Daniel Henney) will be pulled off his undercover mission and dropped into the interrogation room when he is suspected of working for the smugglers he is supposed to be investigating.

While the team sorts out Angelo's possible misadventures, Kensi and Deeks will have a lot of catching up to do.

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"I don't think anybody understands them better than they understand each other - but that could also make for a wonderful friendship," Ruah told TV Guide. "It doesn't necessarily mean that they'll become a couple. I think they have to set their priorities straight, before anything could ever happen. What's more important: their job or their future life together? ... I'm actually indecisive of where I would like them to go."

Hopefully fans will get a few answers regarding the future of Densi during "Three Hearts," which will air as episode 21. Click through the photos above to find out more.

NCIS: LA airs Tuesdays at 9 p.m. ET on CBS. Click the video below to see a preview of the series' next episode, "Windfall."