My son reads on the Kindle app at school using his phone. I checked my email and there was a purchase of this book that I didn't make. He was trying to download the sample and instead accidentally clicked the one click purchase button. Luckily I had a gift card in my account so it was not a big deal. If anyone knows how to take off the one click purchase option on kindle PLEASE let me know. It's so easy to make a mistake. Anyway, he read the book and says he really liked it. He loves this series and hopefully I'll be able to afford to get them all for him over time. At least he bought a book he was interested in, right?!