Blair believes there’s a possible loophole in her prenup. Meanwhile, Chuck conspires with Georgina on a scheme; and William returns to support his family in a crisis

Dan discovers that a comedy group is performing excerpts from his book. Elsewhere, Blair attempts to salvage her friendship with Serena; and Ivy runs into the van der Woodsens as she heads out of town.

Nate hosts a Valentine’s Day party, which Georgina crashes. Meanwhile, Blair tries her hand at matchmaking; and Serena is startled by something she observes

Blair wrestles with making a challenging decision about her future. Meanwhile, Georgina tracks a scandal; and Serena protects someone by accepting blame.

Chuck struggles to accept Blair’s pending nuptials to Louis, and Georgina returns to town in time to cause havoc for the bride-to-be.

Blair’s flashbacks reveal the fallout of her and Chuck’s car accident, which Nate realizes may have been caused by foul play. Meanwhile, Lily gets a private eye to locate Charlie; and Vera Wang makes an appearance at Blair’s bridal-dress fitting.

Lily hosts a bash so Charlie can make her formal debut in New York society, but Max puts Charlie’s upper-crust future in jeopardy. Elsewhere, Dan considers admitting his true feelings to Blair.

CeCe’s family gathers for a Studio 54 party thrown in her honor. Elsewhere, Nate takes on bigger responsibilities at the Spectator, where his first lead story hits too close to home; and Blair seeks assistance from someone unexpected

Serena plans a wedding shower for Blair, complete with misleading info to keep Blair in the dark. Meanwhile, Chuck and Dan bond over not being on the shower guest list; and Nate and Serena are torn about giving Diana ammunition against Gossip Girl