Meghan Grana

And that's when it started . . . the inside-out squeezing, pulsing, whirly feeling in Penelope's belly. Meet Penelope Pickleberry, first-grader extraordinaire. Penelope can do lots of things, like pack her own snack and tie her shoelaces in under thirty seconds. But Penelope has one huge problem—Nelly, the negative voice in her head that tells her about bad things that...