The Eighth Dwarf to me seems like a thought experiment of what would happen if you dropped a Tolkien dwarf in with Doc and Dopey and the rest of the bunch. And old-age Tolkien dwarf, one with an unhealthy obsession with gold. Tiberius is that greedy, self-absorbed dwarf, with a sense of superiority over the other seven of his peers; they are happy passing the time in the mines, whereas Tiberius wants money and power, maybe even a title.
This is not your mother's Snow White. There's violence and death and a whole lot of innuendo, if not bypassing innuendo altogether at times, but all done well and serving a clear purpose. What the book is not, is sensationalist. Tiberius is a deeply-flawed, easy-to-hate character who eventually comes to terms with his flaws, due to a chance encounter. Everything that may shock or rouse the reader relates directly to that character struggle.
Overall, the writing is good and the pacing fast. There are a few minor bits that don't make perfect sense, and a few parts that seem rushed, but they do not distract from the core narrative. If there is anything I am disappointed with, it is how little attention is paid to Tiberius seeming to be the only dwarf in the capital. Indeed, he is treated like any other man. For a book with adult content and addressing adult themes, it seems odd to not deal with adult prejudices. Another dwarf does appear later in the story, but as the world has shown us, even a well-populated minority never gets away free of social scars.
All in all, a commendable debut for R.A. Goli.