What event drives Blair Waldorf over the edge, causing her to ditch the old Blair and embrace a wilder, more unpredictable lifestyle in "The Grandfather"?

How will the story line of Chuck Bass' mystery woman, Elle, become intertwined with the reappearance of his sworn enemy, Carter Baizen, next Monday?

Who are these three folks below and who are they scheduled to play in the Gossip Girl spinoff / prequel starring Brittany Snow and Krysten Ritter?

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