The beloved author of Posted and Ms. Bixby's Last Day returns with the first book in a coming-of-age sci-fi duology about Leo, a kid trying to navigate the galaxy in order to save his family—and, possibly, the planet Earth. When scientists discover a rare and mysterious mineral buried in the Earth’s crust, they have no idea that it just happens to be the most valuable substance in the entire universe. It’s not long before aliens show up to...