Instruct: Classify Amazon reviews into positive or negative sentiment
Query: In demand!

I have "issues" with my aging father, and this book helped so much. I also emailed Ms. Marcell with a question, and she promptly wrote me back with a suggestion. Wow, to actually "speak in person" with the writer is quite special. I have also joined an online book lovers group called Bookcrossing.com -- please check out this website! -- where I registered this book as one of my collection. Almost immediately a gentleman in the south requested I send him my copy because of its rave reviews. I realize he's not "buying" his own copy, but through word of mouth, more of Ms. Marcell's books WILL be sold using this Bookcrossing.com website.