Instruct: Classify the given review into positive or negative sentiment.
Query: Very Frustrating

I tried to like this book. I honestly did. My kids and I have been through the Fablehaven series, the Pendragon Series, the Percy Jackson series, the Septimus Heap series, and the Sisters Grimm series. We're not new to the genre, but this book was so tedious. I have had a really hard time getting into this book. Leven is really annoying. His self-doubt is over the top, and I found myself getting tired of it really fast. We finished the book, but we'll be moving on to a different series after this.