Lost ebook

I purchased “iPad 2: The Missing Manual” ebook from EBOOKS.COM via Amazon on 5/1/12. I installed the ebook on my iPad in the eBook Reader app & had no problems accessing the ebook. Today I received an update to the eBook Reader app & “The Missing Manual” is gone (MISSING!) after I updated the app. The only ebook on the Reader is Beowulf??? How do I recover my Missing manual?
William Fawley
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