Bad book from a favorite author.

You know, if an author has written enough books, then at some point he will stumble and write a bad book. Either he will start with a bad book, but gradually begin to write good ones, or vice versa, he will write good books at the beginning, but the latter will be worse.

I mean, everyone has they favorite author, and so you take his random book, either the first or the last, and you realize that it's bad.

For example (just an example, not my reading experience), Ira Levin. I liked his "Rosemary's Baby," "The Stepford Wives," and "This Perfect Day." And I wanted to read his latest book, "Son of Rosemary," and it was so bad. Everything that made the first part good is missing from the sequel. The atmosphere, the tension, the excellent villains.