'The Blacklist' season 4 spoilers: team mole to be revealed; Liz becomes a thief and Tom works on fatherly duties

When "The Blacklist" season 4 returns to the small screen in two days' time, there will only be one question in the minds of viewers — Who is the mole?

It is the mystery that NBC has been building up for the show's highly anticipated return. The official Twitter handle for the series teases that "You will have to wait and see" to find out the answer to the question.

"The Blacklist" season 4 will be back this Thursday with episode 9, "Lipet's Seafood Company." Here, the loyalty of the task force will be teased as they investigate an international terrorist operating on American soil.

During the investigation, it is believed that one member will turn against the team. Who that will be is anybody's guess at the moment.

NBC wants fans to believe, at least based on the teaser for "The Blacklist" season 4 episode, Aram (Amir Arison), Ressler (Diego Klattenhoff) or Samar (Mozhan Marno) could be the person on the inside.

Aram, on this "The Blacklist" season 4 episode, will still be dealing with the aftermath of his girlfriend hacking into the system of the Federal Bureau of Investigation (FBI).

The million-dollar question will soon be answered as the series will be back this week already. New details on the episodes that will follow were also revealed.

"The Blacklist" season 4 spoilers tease that in an episode ominously titled, "The Harem," Liz (Megan Boone) will channel her inner thief to infiltrate an organization of female thieves. The title, however, suggests that Liz will do more than just that so she could be in bigger trouble.

Tom (Ryan Eggold) will also be back, but to take care of her daughter Agnes for his fatherly duties while Red explores a "business opportunity" as he deals with some unexpected hitches in his plans.

"The Blacklist" season 4 returns with episode 9, "Lipet's Seafood Company," on Thursday, Jan. 5, at 9 p.m. ET on NBC.