After a brief encounter abroad, Chuck and Blair make a promise to each
other about their relationship, which leaves them once again apart. Dan,
with some help from an unlikely ally, Georgina, is writing a scathing tell-all book that can only mean
trouble. As the sole head of The Spectator, Nate is making his own
decisions and is ready to go up against Gossip Girl. As word spreads
that Serena is missing, the gang bands together to find her and are
shocked by what they find.