This book is full of action and adventure, and most of it takes place underwater, which is kind of a neat setting, if you are a diver. Nina Kirov goes off in search of ancient ruins, and finds a possible relic that could rock the world, proving that Columbus was not the first to discover America. A sinister organization called "The Brotherhood" also is aware of this relic and will stop at nothing to ensure that this relic, and others like it, never surface (pardon the pun). What bothered me the most about this book is it's unbelievable convenience of action. Before long, Nina has every resource imaginable, including the U.S. government and every research boat she could possibly need at her disposal, along with the best professionals in the world helping her out. Though the research done to write this book must have been phenomenal, (it is typical Clive Cussler after all), it doesn't ring true and it doesn't ring believable. Each horrific encounter of NUMA and the brotherhood is described in fantastic detail, yet the outcome is more than predictable, causing more than a few ho-hums. The characters read like robots, they don't seem to have much emotion at all, even Nina isn't developed enough to spend sufficient time grieving over a tragic slaughter of her favorite mentor and others. I think Clive Cussler, like Tom Clancy, spends too much time focusing on technical jargon and research findings than on developing his characters to the point where the average reader can put him/herself in their place. If you can't place yourself within the story,then you can't relate, and this is a book I just could not relate to. On the other hand, divers, underwater fanatics, and especially marine biologists and oceanographers will love this book. Anyone with an interest in the ocean and ships will fall right into this book. If you are out for a simple pleasurable story, my advice is to look elsewhere.