The Long Earth is a captivating space thriller mystery book written by Terry Pratchett and Stephen Baxter. The story is set in a world where humanity has discovered the existence of parallel Earths, accessible through a device called the Stepper. As people start exploring the Long Earth, a mysterious message from an unknown sender sparks a race to uncover the truth behind the creation of the parallel worlds. With its blend of science fiction, adventure, and mystery, The Long Earth offers a fascinating exploration of infinite possibilities and the consequences of human curiosity.