THE THIN PLACES is the first volume of a geological horror saga exploring humanity's response to continental-scale temporal correction. When fractures along glacial boundaries allow the Pleistocene to return, DNR officer Dave Pritchard and sixty-two others refuse federal evacuation from Antrim County, Michigan. Over seven years, they pioneer adaptation methods—partnering with displaced Paleo-Indian populations, defending against extinct megafauna, and building hybrid communities that exist in multiple eras simultaneously. As correction spreads beyond the Great Lakes, their survival model becomes humanity's template for adapting to a world where the past is literally overwriting the present. Book One establishes the phenomenon, the rules, and the cost of survival in the first correction zone—ground zero for a transformation that will eventually reshape the planet.