Through a series of emotional flashbacks, Blair (Leighton Meester) reveals to Serena (Blake Lively) what really happened in the aftermath of her tragic car accident with Chuck (Ed Westwick). Meanwhile, Nate (Chace Crawford) discovers information about the accident that suggests possible foul play. Lily (Kelly Rutherford) is worried by Charlie’s (Kaylee DeFer) long absence and decides to hire a private detective to track her down. Vera Wang makes a cameo as herself at Blair’s dress fitting. Penn Badgley and Matthew Settle also star.
