In the fourth book of the Ethan Strong series, Ethan travels back to the 1960's during the Counter-Culture. He lands in the home of unsuspecting Erwin and together they explore the personalities who influenced society with alternative ideas on life. Along the way, Ethan manages to influence World Outcome in his own way. Please note: Although part of the Ethan Strong series, this book veers off from the first three a little. You can read about that here.