5. Monstrous Ball

Complete story — includes the ending

After her mother gives Blair an ultimatum, Blair is determined to remedy Waldorf Designs' problems by making a splash with a dress at the upcoming cotillion, but a shocking revelation at the ball affects everyone. Serena becomes worried about Steven's attitude toward her, but after some investigating she discovers the surprising reason why. Sage learns that her father plans to propose marriage to Serena and plots an all-out attack to destroy the engagement once and for all despite the risk of endangering her relationship with Nate. Chuck finds an unlikely ally in Ivy as he tries to drive a wedge between Bart and Lily's relationship to help expose his father's secret. Meanwhile, Dan publishes another article, but the effect is just the opposite of what he was hoping for as Georgina continues to pressure him to publish more. Elsewhere, Rufus learns about Ivy's inheritance as she continues to help him rebuild his life. Title reference: The 2001 film Monster's Ball.