The Long Utopia

The best book in the series since the first one. Instead of just exploring the Long Earth's, here we get antagonists, real conflicts, and some interesting revelations.

We learn more about the history of the “natural steppers,” ancestors of Sally and Joshua. There's an interesting parallel between how the the British government treats the steppers and how the human governments of the Earth and Low Earths tried to treat the Next.

The big bad in this book are a group of very alien beings that the humans can't communicate with so a more extreme solution is required. Humans and Next have to work together and real sacrifices have to be made to save the future of the Long Earth.

Really satisfying. And as always the writing style makes these books a pleasure to read.