Shortly after it debuted, my publisher ran ads for the book on Amazon. A few weeks ago, we discovered that Amazon blocked the book's ads after the mass shootings in Dayton and El Paso.Why? Because the cover has a gun on it.

Further, they said they'd reinstate the ads only if we revised the cover. Here's the note from Amazon's legal team:

If approved with changes, the following changes must be made: This book cover is blocked at the moment due to the critical event policy that was activated 8/4/19 following the mass shootings in the U.S. We would be happy to revisit the ad after 8/12/19, but the cover image will not be approved as-is. An updated ad would need an image without a gun.