The Long March (novel)

The Long March is a science fiction novel by British author Terry Pratchett and British author Stephen Baxter. It is the first book in The Long Earth series, co-written by the pair. Published in 2012, the novel explores a world where, in 2015, a device called the "Stepper" becomes publicly available. This simple device allows anyone to step sideways into a parallel Earth.

The novel's central premise is that an infinite number of parallel Earths exist, each slightly different from our own, stretching in both east and west directions. These Earths are largely uninhabited by humans, although remnants of hominid species are sometimes encountered.

The narrative follows two main characters: Joshua Valiente, a naturally gifted "Stepper" who can traverse these alternate Earths without the aid of the device, and Lobsang, an artificial intelligence inhabiting a Tibetan motorcycle maintenance worker's body. Joshua is recruited by a mysterious organization, while Lobsang, or rather a copy of him, embarks on his own independent exploration of the Long Earth.

The novel examines the societal, environmental, and philosophical implications of this new ability to step into other Earths. It delves into themes of overpopulation, resource depletion, the nature of humanity, and the potential for both progress and destruction that comes with the ability to access an infinite frontier. It also touches on the impact of the Long Earth on established religions and the rise of new belief systems.

The plot centers on a growing threat from an unknown source emanating from the far western reaches of the Long Earth, which prompts the main characters to undertake a long and perilous journey to investigate and hopefully avert a potential catastrophe. The novel is known for its exploration of complex scientific concepts presented in an accessible way, and for its character-driven narrative.