Big things are coming in the upcoming episodes of "NCIS: Los Angeles" season 7.

The long-running police procedural drama will take a one-week break before the members of the NCIS team deal with a big case involving Callen's (Chris O'Donnell) former love interest, Anastasia "Anna" Kolchek (Bar Paly).

In the upcoming episode titled "Matryoshka," the team will have to go undercover to help Anna locate her father.

According to the official episode synopsis, "In order to locate Arkady in Russia, the NCIS team goes undercover with his daughter, Anna, at a gala in Los Angeles to gain access to the Russian Consul General's computer."

The episode will set the tone for the two-part "NCIS: Los Angeles" season 7 special, which is expected to bring back Callen's friend and Anna's father Arkady Kolcheck (Vyto Ruginis) back from hiding. However, there are no details yet regarding the conclusion of the two-part episode that will air on Feb. 8.

The previous episode centered on the progress of Kensi (Daniela Ruah) and Deeks' (Eric Christian Olsen) relationship, as they decide to move in together.

In the episode titled "Come Back," Kensi and Deeks told the rest of the team that they were planning to take their relationship to another level by living together. But they faced a little bump along the way when Hetty (Linda Hunt) assigned them to look after Jack (guest star Matthew Del Negro), who possesses a very important list of contacts in Afghanistan. Jack also happens to be Kensi's ex-fiancé.

The partners-turned-couple had a hard time dealing with Jack's presence, especially since Deeks knew how hard it was for Kensi when Jack left her to stay in Afghanistan. But in the end, Kensi realized how much she loves Deeks, and the two continued their plans to live in the same house.