Thirteen reasons why-ending

I recently finished reading Thirteen Reasons Why by Jay Asher. I had originally chosen this book because it was recommended by a friend, and I'm glad I chose to follow that recommendation. Though I had expected a different genre based on what I knew of the book, I thouroughly enjoyed this mystery novel. The book mostly centers around the life of Hannah Baker, a suicidal teen who died a few weeks previously to when the novel takes place. She makes a series of thirteen tapes, each mainly focusing on a specific person's impact on her life, or, as she likes to call them, her thirteen reasons for taking her own life. The narrator, Adam, is surprised when these tapes arrive on his forested, as he has no idea what he could have done to make it onto those tapes. Hannah's sadistic attitude in tormenting her "reasons" becomes clear when she refrains from telling each them where they occur in the tapes, forcing them to listen through until they reach their own story. Each, of course, hopes they are not reason thirteen, the person Hannah ultimately blames for her death. Hannah keeps Adam and the reader guessing throughout the novel, raising many chilling questions. Where does he appear in the tapes? What could he have done to lead Hannah to this? And who is "lucky number thirteen"? Though clues are included to help lead the reader toward the answers of these questions, the true ending will ultimately take you by surprise. I would recommend anyone who enjoys a good mystery to read this book, and engine else who just likes to read, as it is one of the most well-portrayed young adult novels out there.