(different from the movie plot)
everyone departs for King’s Cross. On the train, Harry finds he is more famous than ever, but sits with Neville and Luna until Slughorn invites him to tea. After hours of boring conversation, Harry sneaks into the Slytherins’ compartment, invisible, and listens to Malfoy brag about working with Voldemort, but when the train stops Malfoy freezes Harry and leaves him behind.