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Chuck and Blair make a promise to each other. Dan enlists Georgina to write a tell-all book. Nate decides to have The Spectator go after Gossip Girl. The gang is stunned at what their search for Serena turns up.

Aaron Schwartz, Barry Watson, Michelle Trachtenberg, Robert John Burke, Sofia Black-D'Elia, Alexandra Fiber, Andrea Gabriel, Roby Schinasi