Everybody's secrets are coming tumbling out as The Blacklist moves towards its season finale.

Tom Has A Vital 'Piece Of Some Larger Truth,' Will Red Or Liz Uncover It First On The Blacklist?

There are some betrayals Liz Keen (Megan Boone) will never be able to forgive. Her husband's secret agenda is one, and Red's murder of her adoptive father is another.

It looks like contents of Tom's (Ryan Eggold) mysterious box 3929 may tip his wife off to Red's (James Spader) murder of her ailing father, and it will not be a realization the FBI profiler will take kindly too. Even if the envelope contains some other detrimental information, by time the season's penultimate episode ("Berlin") rolls around, Liz will want nothing to do with the master criminal.

New Clues About A Shocking 'Blacklist' Finale, A Major Death, The Identity of Berlin

"[The envelope is] gonna ruin a relationship that's very important to her," Boone teased, according to Yahoo! TV. "It's yet another one of those."

Considering the amount of life changing event's Liz has witnessed throughout season 1, Mrs. Keen will soon be shedding her naïveté and innocence as she attempts to get a grasp on her ever-changing world.

"I was ready for her to stop being somewhat naïve and so thrown by everything and so open-hearted, because the people around her weren't deserving of that at all," Boone told Yahoo! TV of her character's transformation. "Now she recognizes it, and because it's the situation she's in and what life has handed her, she's just going to go a little bit off the rails and a little bit darker."

Fans can start to see Lizzie turn to the dark side just a little bit more during "The Kingmakers," which airs Monday at 10 p.m. ET on NBC. Click the video below to see a preview.

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The Blacklist, Nbc, Television