Retired JPL engineer Henry Hume believes there is a hidden planet on the far side of our sun. He has over a hundred years of data telling him just that, all in cardboard boxes. It's enough to convince NASA to launch a probe at least.But things don't go quite as expected. The denizens of the Hidden World have an agenda of their own, and have long lived in fear of the humans.Is it NASA's last mission before political turmoil shuts the agency down? Who will save us as the world unravels before our very eyes?