Chuck and Serena join forces to investigate the mysterious Elle, but they uncover something much more unsettling about Bart Bass’s past.

The Upper East Side is buzzing, and for good reason. If you’re looking to watch , titled " The Kids Are Not All Right ," you’re in for one of the most dramatic shifts of the season. Episode Recap: The Plot Thickens

In this installment, the fallout from the previous episodes reaches a boiling point. The episode centers on the complex family dynamics of the van der Woodsens and the Humphreys.