The matter that makes up the world we know only accounts for less than 5% of the mass of the entire universe. So where is the other 95% of the universe's mass? What is it like? A soul that travels across time and space accidentally encounters a mysterious and strange shadow world. Tearing apart the bloody and ignorant appearances and dispelling the mysterious and strange fog, evolution and truth unfold before his eyes. P.S.: The original inspiration for this book comes from the American TV series "Stranger Things".