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 read hundreds of mystery and thrillers books every year. This one of the best I have read for some time. This was an excellent murderr/ mystery which was hard to put down. An absolute page turner and a pleasure to be able to recommend it to all