The Blacklist's Liz Keen will soon turn to her Tom's brother in an effort to unveil her husband's true identity.

Prepare To See Tom Keen 'Like You've Never Seen Before,' Who Is Ryan Eggold's Character Working For On 'Th Blacklist'?

The mystery surrounding the seemingly innocuous Tom Keen (Ryan Eggold) is steadily deepening. Unbeknownst to Liz (Megan Boone), her significant other is really working for some unknown entity as he keeps tabs on his "target" (also known as his wife).

Liz will not be in the dark for long, however, and E! promises that the FBI profiler will find out Tommy Boy's dirty secrets "sooner rather than later."

Did Red Tell The Truth About His Family On 'The Blacklist'? James Spader Explains Ramification's Of Deaths

At some point, Liz's investigation will lead her to Tom's so-called "older brother," who TV Guide reports shockingly (surprise, surprise) isn't on the level either. While Tom doesn't appear to know who Jolene/Lucy Brooks (Rachel Brosnanhan) is, there is a distinct possibility that his "sibling" will.

Looks like viewers can add one more revelation to the ever-growing list of reasons why Red (James Spader) has been adamantly insisting that Liz be wary of her alleged husband.

As for Liz, she may not handle the "spectacular" Tom/Jolene/Lucy Brooks/Red fallout particularly well.

"She's been through a lot to build what is seemingly a perfect life with her husband. But despite all your efforts, despite everything you've been through and all you've done to try and build this life for yourself, the life you built isn't what you think it is," Boone lamented in a Beyond The Blacklist featurette.

Find out how the Tom/Liz story plays out when The Blacklist airs Mondays at 10 p.m. ET on NBC. Click the video below to see a preview of the series' next episode, "Mako Tinada."