Chamber of Secrets is my least favorite book of all the Harry Potter books. Now I can see the importance of the book in the overall story but at the time I read it it seemed to me to be a typical second book of a series. The heroes go and fight the same villain that they fought in the first book and beat him again but in a slightly different way.
Also, who tries to get rid of a book by flushing it down the toilet? Even Muggles know better than that! Of course, you can flush yourself down the toilet to get to the Ministry of Magic so maybe that isn’t such a crazy thing in the wizarding world.
And, they need a better janitor at Hogwarts. How long has that toilet been overflowing without being fixed? That’s just wasting water. (I wrote a line about the water bill being horrendous and then had a whole mental discussion with myself about Hogwarts probably having wells or drawing water from the lake. What does it say about me if I am mentally diagramming the plumbing system of a fictional world.)
This is one of the few instances where I liked the movie better than the book. Seeing it on screen made me appreciate the book more than I had before. I was surprised by that.