Plot summary
Rufus and Lily grow angrier and more suspect of Jenny's relationship with Damien in which Jenny decides to rebel by revealing Damien's drug-dealing profession. Meanwhile, Chuck confides in Blair, Serena, and Nate about his investigation into the mysterious woman, Elizabeth Fisher, who may or may not be his mother. Elsewhere, Dan and Vanessa struggle through the awkwardness of dating other people when they attend a college beach party with their respective dates. Serena makes a decision regarding finding her father after having a talk with Chuck's mother. Title reference: The 1938 film The Lady Vanishes.
Credits
Adapted from Wikipedia contributors, Gossip Girl season 3. HTML formatting and reference markers removed.