The Sigman Force is witness to the potential end of the world.   Earthquakes and volcanic eruptions that seem to originate in the Tonga Trench are portending catastrophic results.  The Chinese are deeply involved and an old enemy shows up.

Rollins does an excellent job maintaining a high level of anxiety while providing non-stop action.  His afterword answers many of the questions that arose while reading the Book.  

This book was both entertaining and enlightening.  I highly recommend it. 

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