Mallory doesn't know how she feels about the new girl, Jennifer Chan. Jennifer speaks her mind, believes in aliens, and embraces what makes her different, when all Mallory wants is to fit in. That's why Mallory has her friends Reagan and Tess. They might not be the nicest girls, but they know exactly how middle school works. But when Jennifer goes missing, Mallory is pretty sure it's all her fault. The Incident wasn't her idea, but Mallory didn't try to stop the bullying either. The adults say Jennifer has run away before ... but what if it's something else? Mallory is determined to follow the clues about alien encounters from Jennifer's journals. The closer she looks, the more Mallory wonders if Jennifer's aliens could be real ... and if friendships old and new can be saved. Tae Keller explores a story of shifting friendships, redemption, and learning we're never really alone.