This story has a bit everything from science-fiction to adventure. It takes place in Ohio and Hawaii as the lead group tries to solve a mystery. I won't put in a spoiler, but it involves a new form of transportation. I liked the way the lead characters gave serious consideration to what their discovery might do to the economy. It was a very realistic approach, and completely enjoyable to read from the start to the end.
Preston's multignre novel keeps the story moving with impressive momentuym...Watching Jim and company discover the obsidian's potential is riveting.