I dont think that eBooks are assigned try ISBNs. I lookes in Amazon and Fictionwise at Dan Brown's The Lost Symbol to compare and at Amazon it is obvious and it is actually ASIN: B002KQ6BT6
Over at Fictionwise it has IBNs listed for 2 formats (Mobipocket Reader ISBN: 9780385533133 eReader ISBN: 9780385533133 ) but when I looked them they didnt come up. That would explain why Calibre finds nothing.
I suggest deleting the ISBN that comes up and then try to get the metadata again and Calibre will attempt to look for the author and book name.
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