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200 MB suggests you have a lot more in the book than text. As others have mentioned, maybe the book is made up of pictures of text, in which case there might not be much you can do about it short of running it through an OCR program and fixing the errors by hand.
Personally the first thing I would do is unzip the file to look at what's stored inside. Epub books are actually zip files. You can then identify what's taking up the most room. If you're really lucky, it's something not actually important to the book, and you can fix the problem by deleting it in Calibre's editor or another tool.
If you can get more detail on the problem this way, we might be able to give you more specific advice.
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