The Long Earth is a thrilling space thriller mystery book written by Terry Pratchett and Stephen Baxter. In this alternate history science fiction series, multiple parallel Earths are discovered, each slightly different from the others. The story follows Joshua Valiente, a man who can step between these parallel Earths, as he embarks on a journey of exploration and discovery. Along the way, he uncovers the mystery of the Long Earth and encounters strange creatures and civilizations. The Long Earth is a captivating blend of adventure, mystery, and philosophical exploration, making it a must-read for fans of space thrillers.