“The Blacklist” Season 4 might see Elizabeth Keen (Megan Boone) being forced to betray Red (James Spader) after learning a shocking secret.

NBC has released “The Blacklist” Season 4, episode 5 synopsis, which teases that Liz may have some hard choices to make in the next installment. In the past episodes, the people around Liz haven’t exactly inspired trust and confidence. Red remains just as secretive. Alexander Kirk (Ulrich Thomsen) might be telling the truth that he’s her biological father, but he also hid many things from her, including the rare genetic disease that forced him to seek out his only child after all these years. Tom (Ryan Eggold), like Liz, only wants to rescue their daughter Agnes, but he’s proven that he’s not above going behind his wife’s back to do whatever it takes to get closer to Kirk.

In “The Blacklist” Season 4, episode 5, Liz and Red’s tattered relationship could be tested yet again. Based on the synopsis, Red is moving forward with his plan to use Kirk’s hematologist, Dr. Sebastian Reifler, to find his location. But it’s possible that Liz might do something to intercept him because she learns that Red might have been lying to her again.

The trailer for “The Blacklist” Season 4, episode 5 teases that Liz discovers a DNA report which suggests that Red might have been lying about her father and her past this entire time. Liz becomes desperate to get Agnes back and might become reckless in the process of attempting to rescue her daughter. Check out the full synopsis and trailer below!

“Liz’s (Megan Boone) loyalties are tested as Red (James Spader) takes action on an operation to intercept Alexander Kirk. Meanwhile the Task Force races to find a killer who targets inventors of revolutionary technology,” read the synopsis, according to CarterMatt.

“The Blacklist” Season 4, episode 5 airs on Thursday, Oct. 20 at 10 p.m. ET on NBC.

red the blacklist Red (James Spader) may have been lying to Liz about her father in "The Blacklist" Season 4. Photo: NBC