Take Pippi Longstocking's joie de vivre, blend it with a 21st century urban setting, toss in a dog named Otto for good measure and what do you get? This joyfully carefree story about two unlikely friends.

It's a pair of silver sequined sneakers that unexpectedly flips Emily's comfortable, predictable world upside down. Or, more precisely, it's the girl wearing them. The shoes belong to Rani, who moves into Emily's apartment building-and her life-with absolutely no one but her dog Otto. (Her research scientist mother is away in Patagonia.) And that's only the first rule that Emily watches Rani break without hesitation.

But it's not just that Rani breaks rules. Most of the time, she doesn't seem to know the rules exist. Why can't she bungee jump off their building? Or bring an ice cream truck to school? For steady and orderly Emily, Rani's approach to life feels impossible . . . and more than a little irresistible. But is there a place for her in Rani's world? And should she find a way to make space for Rani in her own?