Book does not show on device view in Calibre
I am using Calibre 2.37.1 on a Win 7 32 bit PC with a Kindle Voyage
When I use the device icon to view books on my Kindle Voyage one book does not display in the grid. This is a free book from Amazon that I got three days ago. When I use Explorer to look at the Kindle, I can see the folder the book supposed to be in, but there is no AZW3 file in that folder or it's sub-folders. I can read the book on the Kindle, but Calibre can't see it.
I have attached the book. I looked at the files, and they don't seem to be encrypted.