Shockwave

Thirty years after the Devastation, when astounding tree growth destroyed technology and much of humanity, the Metchosin clan is thriving, perfecting their self-reliance with ongoing education about such subjects as herbal medicine. But no matter how simple life may be now, questions always arise. Miles is writing a backwards history of mankind, trying to find out where the human race went so wrong that it almost destroyed itself as well as planet Earth. When he finds the answer, Casey plans to take the news to other clans. What puzzles her is why she'd rather travel than partner with Cam, whom she loves deeply. Even the Earth itself raises questions about survival. A megathrust earthquake erupts, then a tsunami, violent reminders that natural forces are stronger than humans. The shockwaves will reverberate for years to come.