A Better Ending: A Brother's Twenty-Year Quest to Uncover the Truth about His Sister's Death

I couldn't find any information that suggests this book is a Study Guide. Based on the title and publisher, I would categorize it as a Memoir or True Crime book.

Here's a revised product description:

"A Better Ending: A Brother's Twenty-Year Quest to Uncover the Truth about His Sister's Death is a memoir by an author who recounts their personal and investigative journey to uncover the truth about their sister's death. This hardcover book is published by Avid Reader Press / Simon & Schuster. The author's quest spans two decades, driven by a desire for justice and closure."