Watched, shared on Facebook, email sent to HarperCollins and the Open Letter is now shared on Facebook with a mention that an email address is included. Phew.
I thought it was interesting they said they could fix the one that had been checked out 120 times and had the loose binding.
That's a fairly common repair, the last library I worked at showed me how. Now I can extend the life of my personal books.

The best tip though? If a book gets wet, put it in the freezer as soon as possible. It'll stop mold/mildew growth and the water will evaporate.