I was not originally going to review this book but disagreed wildly with the other reviews. I thought the mining detail was one of the most interesting facets of the book, not at all hard to follow, and added immensely to my enjoyment of the book. Similarly, i was delighted with the non-formulaic nature of the plot; it is intriguing not to be able to unravel the whole thing on page 10 or so. I also enjoyed the digression into the character of the missing geologist and his relationship with his wife. For me, the most unconvincing and flattest part of the book is Em's relationship with Ray, her ostensible love interest. Maybe he will develop some in later books, but I just could not believe that this woman could have reached the point of thinking about marrying someone who wants her to abandon the intellectual side of her nature. Nor am i convinced by Em's repeated soul-searching and rejection of requests to helf the FBI. This woman could not be this un-self-aware.