It is, in the author's words "a historical entertainment". Historical fluff is more like it. Now don't get me wrong, I enjoy fluff on occasion, but it has to be well-written fluff. This is the story of Josephine Bonaparte, first wife of Napoleon, told from her point of view. But the author tries to cover too much time over too short of a book, so you don't get to know the characters, and many events are skimmed over; and time tends to skip around erratically.
If anyone is interested in historical fiction about Josephine, I would highly, highly recommend the trilogy of books by Sandra Gulland - The Many Lives and Secret Sorrows of Josephine B.; Tales of Passion, Tales of Woe; and The Last Great Dance on Earth. Those books, the fictionalized diaries of Josephine Bonaparte, draw you into her story and are so well written that while you are reading them, the reality of the story is more real than the reality around you.