Well,
The Heart Foundation Book is listed as a freebie in the Kindle store, courtesy of publisher Shannon Ravenel.
Now, I couldn't begin to tell you what this book actually is, because this is unavailable to Canadians in the Kindle store. I can't even download a sample to check without doing a whole bunch of hoop-jumping.
There is no author listed, no description or reviews whatsoever, and the cover included is for a book entitled "Younger Next Year: Live Strong, Fit, and Sexy — Until You're 80 and Beyond".
Maybe this is the book they're actually offering, maybe it's something else entirely.
All I can tell you is that it's not Topaz and it was 330 pages when originally printed circa 2007 (maybe), though that doesn't preclude it from being self-published, though it does look like it's probably some form of self-help.
So, if you enjoy mysteries, well, here's a Kindle one for you to enjoy!