Angelica Button and The Dragon King's Trundle Bed

Angelica Button and The Dragon King's Trundle Bed is a book in the series by T.R Francis.

Plot
Headmaster Greystash is killed by Malicious Krubb while Greystash is trying to save Angelica Button from being trapped in an hourglass whose sand nearly buries her. Homer changed the ending to appease Lisa.

Behind the Laughter
It is a parody of Harry Potter and the Half Blood Prince but differs from the plot of the book and some parts of the book have nothing to do with the tale of the Half Blood Prince.