Blair wants to take her teacher down and finds out a secret that she can use as a weapon in the new 'Gossip Girl'.
Things are getting more and more complicated between Blair and her new teacher, Rachel Carr, in the next "Gossip Girl". Blair devises a plan to bring down the teacher in retaliation for not playing by the unspoken rules of Constance Billard and finds it easier when she knows that Dan may have an affair with the young teacher.
In "Carnal Knowledge", Serena spots Dan in a bar with Rachel. After Chuck wakes up in a hotel and only has a minor recollection of what happened the previous evening and who he spent the evening with, Nate and Vanessa try to help him fill in the missing pieces of what is turning out to be an increasingly intriguing mystery.
The episode will air Monday, February 2.
Meanwhile, a scoop from E! spills that a "former bigtime couple" are getting back together and it is neither Blair and Chuck or Nate and Jenny.