Portals

Hidden portals link Earth to numerous other planets. But why do they all contain human civilizations? And why does our nearest neighbor have its sights set on Earth? 
Noah Harris and Ashley Flynn are field agents for a powerful organization tasked with protecting humanity from the misuse of game-changing technology. But when they discover hidden portals that link Earth to numerous planets, put in place ages earlier by transcendent beings, they are thrust into a maze of deception and intrigue they can't begin to understand....one that not only has them battling for their very lives, but that will decide the fate of worlds.
Because, inexplicably, each of the planets contain human civilizations, and the human rulers of our nearest portal neighbor–having already conquered their own world–have come up with a brilliant, twisted plan to conquer ours.
Only Noah and Ashley stand in their way . . .
From New York Times bestselling author Douglas E. Richards, whose books have sold over two million copies, Portals is a masterful near-future thriller packed with action, astonishing twists, and mind-blowing concepts.