Staircase between the first-floor and Serpentine corridors

"[...] running down the nearest flight of stairs, but Peeves merely slid down the banister on his back beside him."

- Narrative

The first-floor corridor and Serpentine Corridor are connected by a staircase, at the bottom of which is Minerva McGonagall's office. Harry Potter used it to deliver a note to McGonagall from Dolores Umbridge during a Defence Against the Dark Arts lesson in Classroom 3C.

Appearances

 * Harry Potter and the Goblet of Fire