Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Who Wrote It?

My 17-year-old granddaughter and I have been reading all the Mrs. Murphy books for the last 6 or 7 years, and enjoy trading the books back and forth and discussing them. But - the latest one, "Cat's Eyewitness," was a disappointment. As other reviewers have stated, there was a lot of preaching and philosophical discussion between the characters, which are Ms. Brown's own opinions. And the lesbian love affair was unnecessary. The Mrs. Murphy novels have become progressively more sex-themed, be it [...]. What began as a good series for a girl and her grandmother to share, has turned into "Should I lend her this one?" Of course, she's a big girl now! But I am disappointed. The murderer's identity was very easy to spot early on. I wondered if Ms. Brown employed a ghost writer for this one. Or maybe Sneaky Pie did actually write it!