Thanks to her best friend, Reagan, Mallory Moss knows the rules of middle school. The most important one? You have to fit in to survive. But then Jennifer Chan moves in across the street, and that rule doesn't seem to apply. Jennifer doesn't care about the laws of middle school, or the laws of the universe. She believes in aliens--and she thinks she can find them. Then Jennifer goes missing. Using clues from Jennifer's journals, Mallory goes searching. But the closer she gets, the more Mallory has to confront why Jennifer might have run . . . and face the truth within herself.