WARNING: This article may contain spoilers for NCIS: Los Angeles season 11 episode 21. Read at your own risk.

NCIS: Los Angeles season 11 episode 21 is set to arrive later this week, with the title "Murder of Crows." This episode will feature again another interesting case, this time helping a former NCIS tech operator. But aside from that, the episode will also bring some personal storylines, including the return of Anna, who allowed Callen to think more of his future.

In NCIS: Los Angeles season 11 episode 21, the NCIS team will help a former NCIS tech operator. She is searching for her missing ex-partner, whom they think working with the gun runners they failed to take down years ago. Things may not be that easy for the team, given that the person they're looking for might be against them. The situation could get complicated and may bring action-packed scenes along the way.

As for Anna and Callen, the latter revealed to Sam that he's about to put down roots with Anna. It's interesting to see where this episode will lead the two, given that Anna allows Callen to consider more about his future. It seems like their relationship is moving in a different direction, as Callen is about to make a big move with the woman he truly loves.

Meanwhile, Deeks will also have his own fun and personal storyline within the episode. Something in his bar goes sideways, wherein he reels after getting a negative review. As for Nell, it remains to be seen whether or not the character will be seen in this episode. Her recent exit may not be her official departure from the series, so there's still a chance we'll see her return at some point.

NCIS: Los Angeles season 11 episode 21 may not be the final one this season as well. According to CarterMatt, there is another episode slated to air later this month. In addition, this will, reportedly, be the final episode this season as well. What's interesting here is that it will feature the return of JAG star Catherine Bell's Sarah MacKenzie.

Mac possibly has an essential role here, which could set up something more for her in the future. One of the main reasons why she returns is because she needs the help of the NCIS team. She'll be asking Hetty's team for some help and take on a complicated case. Mac wants to help two SEALs, who claimed that their chief murdered an unarmed Taliban prisoner.

NCIS: Los Angeles season 11 episode 21 airs on Sunday night, Apr. 19, on CBS.