The Devil and Sherlock Holmes: Tales of Murder, Madness, and Obsession
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From David Grann
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Most Trusted Reviews
- Unverified Purchaser
- Critical Reviewer (avg. rating: 4.2)
Least Trusted ReviewsWe couldn't find any low-quality reviews
We discovered a total of 5 deleted reviews for this product, with an average rating of 4.4. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
4.4 average rating of deleted reviews
Show distribution of deleted reviews
30 of the 92 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.
- Created over 1 day
We counted 92 reviews for this product over the span of 2,626 days, an average of 0.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.
However, we see the following 1 day exceeding this threshold:
47 of the 92 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
31 of the 92 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
- Have an overrepresented word count
In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 1 group with a statistically significant greater concentration than what we'd expect to see:
10% also reviewed:
The Girl Who Kicked the Hornet's Nest by Larsson, Stieg/ Keeland, Reg (TRN)/ Vance, Simon (NRT)
36 of the 92 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
- From reviewers with an overrepresented participation
Read more about our Reviewer Participation test.
4.1 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
- Admitted to receiving an incentive
Read more about our Incentivized Reviews test, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.