Obsidian Portal: Book One In The Mack's Journals Series

Four friends simply planned to kick back and relax... until half of a fish was found on Jim Carson's carpet.

Their simple discovery leads the group on an exciting quest. Have they uncovered a way to instantly transport people? They may have stumbled upon a whole new technology with astounding implications. Could it change the course of world economics and stir up a lot of trouble in the process?

Soon, the race is on to discover the source of a special rock formation as they enter into an adventure of a lifetime. Their explorations and travels lead the group into unexpected intrigue as they seek out a secret cave in Hawaii, the source of the "Obsidian Portals".

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"Preston's multigenre novel keeps the story moving with impressive momentum...
Watching Jim and company discover the obsidian's potential is riviting."--- Kirkus Reviews