Chuck, Blair, Nate, Serena, and Lola team up to infiltrate a secret society meeting at a mansion. They believe a mysterious diary held by Diana Payne contains proof that Bart Bass is still alive.
The episode is well-regarded for bringing the "Non-Judging Breakfast Club" back together for a shared mission, a dynamic often missed in later seasons. Where to Watch Watch Gossip Girl S05E22
The investigation leads to the shocking discovery that Bart Bass is alive and has been hiding in a secret room. Chuck, Blair, Nate, Serena, and Lola team up