Leviathan by David L. Golemon
What if not only The Count of Monte Cristo but also 20,000 Leagues Under the Sea were both based on generations of the same family? This family controls the seas with a submarine that can travel at speeds and depths that no navy on earth can follow. And they have a mission to take back the seas on behalf of the inhabitants of the oceans which humans are killing with their toxins and pollutants. Yes, there is an environmental message here, but it is just a matter of fact one, not a preachy overtone that similar works have taken.
I really enjoy Golemon. He’s got a great knack of combining science, pseudo-science, action and adventure to form a great story. If you’re a fan of the X-Files and miss it terribly, you will enjoy Golemon’s Event Group series.