The Anachronistic Code, Book Two: The Comeback Kid

It's 1985, and Josh Donegal is seventeen … again. And he’s not alone.
Somebody has made changes to the era that Josh grew up in and he’s thinking that it’s a message that can help him stop a future cataclysm before it even happens. But first, he has to decode it, not just for himself and the girl he left behind, but for the future of humanity.