Four different Earths in four different dimensions were left as nothing but lifeless balls of rock and sand after their moons were destroyed. Massive hunks of debris slammed into the planets, ripping away their atmospheres, and extinguishing every last bit of life. With a near infinite number of dimensions, was it beyond the realm of possibility that these four ghost worlds were nothing more than a coincidence, or was it perhaps a coordinated attack, the goal of which was to destroy whoever, or whatever inhabited those worlds? Suspicions and theories abound, but they'll never find the answers they're looking for unless they put boots on the ground. In order for them to do that however, they're going to need some new gear, including space suits, metal detectors and ground penetrating radar. If, as they suspect, these dead worlds truly were inhabited by the race they called the creators, then they not only need to find evidence of their presence on those worlds, but they also need to find out just who it was that attacked them, and more importantly, the reason why. Also, in an effort to repair a relationship that had grown somewhat distant over the years, Jarrod, Derek, Tina, and Sarah invite Patricia to come down to the cabin with them for a little vacation, so they can get things back to the way they were in the early days. While there, they head out to explore an as of yet unexplored dimension. In the process, they find a world that's beautiful beyond anything they could have possibly imagined, but they also find a large supply of an incredibly rare mineral that could just be the key to producing limitless energy. Ghost Worlds is the 8th book in the Unseen Things series.