Sorry, but I have to ask the obvious questions: What format was the book in, and where did you buy it from?
If a kepub from Kobo, which I'm guessing, go to kobobooks.com and check your library, see if the book is in the "I'M READING" section. Once it's there, it should download when you sync (so long as, as paola says, you're logged in to the same account.)
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