“No matter what anyone tells you, I’m real.” That’s what the note says that Max finds under his keyboard. He knows that his best friend, Josie, wrote it. He’d know her handwriting anywhere. But why she wrote it—and what it means—remain a mystery. Ever since they met in kindergarten, Max and Josie have been inseparable. Until the summer after fifth grade, when Josie disappears, leaving only a note and whispering something about “whatnot rules.” As Max sets out to uncover what happened to Josie—and what she is or isn’t—little does he know that she’s fighting to find him again, too. But there are forces trying to keep Max and Josie from every seeing each other again…because Josie wasn’t supposed to be real.