NCIS: Los Angeles season 12 episode 12 is set to arrive this weekend on CBS, with the title "Can't Take My Eyes Off You." G.Callen's (Chris O'Donnell) storyline will be one of the major focuses as he is coming face-to-face with the love of his life, Anna Kolcheck (Bar Paly).

Anna returns in NCIS: Los Angeles season 12 episode 12 after being away from the police procedural for a few episodes. Callen has been trying to search for her whereabouts and he's been looking for answers as to why she really left. While the two reunites, that doesn't mean that their reunion would be a happy one.

There are a lot of mysteries surrounding Anna, particularly whether or not she can still be trusted. Based on the synopsis of NCIS: Los Angeles season 12 episode 12, Callen got a cryptic message from Hetty Lange (Linda Hunt) and this prompted him to track down the person tailing him.

His investigation has led him to a remote location teeming with Russians and he comes face-to-face with Anna. It's yet to be seen whether or not she is related to this particular case and if there's a betrayal at the center of it. However, their relationship might be ruined because of this.

Callen and Anna have been through a lot already, but there's still uncertainty when it comes to their romantic relationship. The latter's location was unknown over the past few episodes, which makes their situation even more complicated.

During the early episodes of the current season, Callen tried to propose to Anna. He is determined to marry her but he's struggling to ask the question. When he found the courage to do what's on his mind, she suddenly disappeared and went somewhere else.

NCIS: Los Angeles season 12 episode 12 could provide some reasons why Anna left. If ever she is doing something shady behind Callen's back, this could fracture their relationship. He does not let a lot of people in his life, and it would hurt him if he finds out that the person he loves betrays him.

Meanwhile, the latest promo shows how Callen discovers Anna's whereabouts. He was able to find her when he and Devin Rountree (Caleb Castille) scout for a location. As shown in the clip, he was shocked when she suddenly showed up in the area that they're investigating.

NCIS: Los Angeles season 12 episode 12 is coming on Sunday, Feb. 28, on CBS.