I installed the app, though I can't remember where I downloaded the apk from (I think it made have been via SlideME app on my tablet since I have no access to Google Market and did not root the device.
I have an amazon.co.uk and amazon.com account. My billing address is in my home country, and my credit card is also issued in my home country. I have never registered an account using a foreign address. I checked my amazon account, and the country settings show as my own country. Usually, if I want to get a book that is geographically restricted, it is plainly shown on the page, but here it seems the only reason I can't access it is because my kindle for PC isn't updated, but the version installed is 1.9.3, last updated 4/15/2012.
The book in question was purchased from the amazon.com account as were all my other books, and I never had a problem with any of them. I checked some of them, and I can access them all.