David Ignatius is known for his uncanny ability, in novel after novel, to predict the next great national security headline. In Phantom Orbit, he presents a story both searing and topical, with stakes as far-reaching as outer space. It follows Ivan Volkov, a Russian student in Beijing, who discovers an unsolved puzzle in the writings of the seventeenth-century astronomer Johannes Kepler. He takes the puzzle to a senior scientist in the Chinese space...