It has happened to me several times, usually with the books recently released. It's almost certainly Google's fault, something in the file is incompatible with ADE.
Basically you have two options. Return the books for a refund and buy elsewhere, or wait for a few weeks and try to download again then. Usually the issue has automagically solved itself after a while. Discussing this with the Google Play customer service won't help (I've done it more than once).
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