The moment an asteroid collides with the Moon and knocks it out of orbit, sixteen-year-old Miranda’s life changes forever. The Moon now looms frighteningly close—huge, gray, and cold. How do you survive when massive tsunamis wipe entire cities and countries off the map, earthquakes shake continents, volcanic ash blocks out the sun, and even a mosquito bite can be deadly? As summer turns into an Arctic winter, Miranda, her brothers, and her mother take shelter in their relatively safe home, where the only source of heat is a wood-burning stove, water is limited, and food supplies may not be enough for everyone. Miranda records each day of this new, terrifyingly unknown life in her diary.