It's an Upper East Side face-off when Blair and Chuck both set their sights on a particular item up for bid at Sotheby's and the personal stakes are high. Meanwhile, Serena suspects that Carter may be up to his old habits and being not completely honest with her. Georgina takes an interest in Dan, and Vanessa begins to suspect that something isn't quite right with Scott. Finally, Bree's true intentions with Nate are secretly revealed: related to Carter and his exploits.