Sam and Callen investigate an NCIS Agent believed to have gone bad on "Three Hearts."
Added:
Sam and Callen have a face off with the Brunsons on "Three Hearts."
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Sam investigates a case (in a hoodie instead of his normal henley!).
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Emily Baldoni (Olivia Brunson), Stephen Wozniak (Tyler Brunson), J. Teddy Garces (Guard #1) and LL COOL J (Special Agent Sam Hanna).
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Kensi returns to the field to work with her partner, Deeks, in "Three Hearts."
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NCIS: Los Angeles Season 5 Episode 21 Quotes

I would never let that happen to you.

Kensi

Deeks: What's in the box?
Kensi: Mmm. That box?
Deeks: I mean, is there any other box?
Kensi: Apparently not.
Deeks: You didn't answer the question.