The Blacklist's Liz Keen will struggle to hide her dark side in season 3.

'The Blacklist' Season 3: First Promo Unveiled; Liz Gets A Make Over, Ressler Gets Dangerous

Ever since Mr. Raymond "Red" Reddington (James Spader) walked into her life, the FBI profiler has found her self slipping further and further from the innocent woman we meet in the series premiere. Now that she has a murder and a kidnapping safely under her belt, Lizzie (Megan Boone) will find it harder than ever to keep her halo aligned.

"It informs this feeling deep inside that there's a criminal instinct that she's trying to resist and trying not to embrace, and yet she's being forced to embrace by virtue of the fact that she's on the run," series creator Jon Bokenkamp teased, according to TV Line.

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It's that criminal instinct, however, that will keep Liz out of the clutches if the FBI. Currently on the run, Ms. Keen will have to delve into the underworld in a whole new way.

"The idea of who she is, what her past is, who her mother was, her ties to Russia, those all play into how she's going to have to survive," Bokenkamp hinted.

Out heroine will even go so far as to impersonate a cop in the premiere. What other tricks will Red and Liz get up to as season 3 begins?

Find out when The Blacklist returns to NBC on Oct. 1 at 9 p.m. ET. See a promo for the premiere below.