Serena loves her new job in Hollywood, but makes a costly misstep when she tries to impress her boss. Chuck and Nate arrive in Los Angeles as the last stop of their Lost Summer trip, joining Serena at a glamorous Hollywood Hills party, where Nate meets a sexy older woman. Blair and Louis return from Monaco and begin planning their royal wedding, but when Louis refuses to stand up to his family and support Blair's choices, his weakness threatens their relationship. A magazine is planning to run an excerpt of Dan's book until an unlikely ally steps in to help him kill the story.
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Complete story — includes the ending
Serena finds a job as a production assistant while spending her summer in L.A, but her work is quickly jeopardized when she tries to impress her new employer in order to be promoted. Nate and Chuck also arrive in Los Angeles, where Nate meets an older woman and Chuck starts making increasingly reckless moves. Meanwhile, after spending the summer in Monaco, Blair returns to New York to hasten the preparation of her wedding, while concealing a secret that could wreck it all. Meanwhile, Dan seeks Louis' help in preventing the publication of a revealing article on Blair written in the spring. Title reference: The 1987 film Less than Zero.