The Fold by Peter Clines

The folks in Mike Erikson's small New England town would say he's just your average, everyday guy. Sure, the life he's chosen isn’t much of a challenge to someone with his unique gifts, but he’s content with his quiet and peaceful existence.

That is, until an old friend presents him with an irresistible mystery: far out in the California desert, a team of DARPA scientists has invented a device they affectionately call the Albuquerque Door. Using a cryptic computer equation and magnetic fields to “fold” dimensions, it shrinks distances so that a traveler can travel hundreds of feet with a single step.

The invention promises to make mankind’s dreams of teleportation a reality. And, the scientists insist, traveling through the Door is completely safe.
Yet evidence is mounting that this miraculous machine isn’t quite what it seems—and that its creators are harboring a dangerous secret.