Thanks for replies, tried suggestions to no avail
in the metadata.db search, the only book shown is the one I downloaded earlier, when I discovered the problem.
does The folder that it is in have lots of folders with AUTHOR names? NO.
The result of the metatada.db search, resulted in the following, one backup json file 14kb, one dbf file 348kb and the recently downloaded book
'Right click the calibre icon in the calibre toolbar and select Library maintenance->Restore database. calibre will automatically rebuild metadata.db." This option not available
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