Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
This was a terrible book, probably written over lunch. I should get my money back. Definitely the last Dan Ames book I buy. Lee Child should be made aware of the books being published with the name Jack Reacher as a drawcard.