The library is saying that one of the books I returned had 'liquid damage'. I'm not entirely certain how there was any damage since this particular book sat on my bookshelf unread and I never put water or drinks near my bookshelves because.... Water damage?

I messaged the library about it. Explained all of that and I'll go from there. They are charging me $27 but I can get the book for $14 on amazon. If they insist that I pay for the book I'll see if I can replace it instead.