Amazon calculates a product's star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I am a great fan of Thriller/Mystery/Suspense genre. So this book was a no-brainer for me as it had garnered quite the attention and buzz. I picked it up thinking it's going to be one of those books with the constant twists and turns that will have me at the end of my seat. But this book is a slow-paced thriller with a mind-blowing twist that I did not see coming.