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 might happen. At the final...