When Mr. Green, a stingy widower with three children he cannot be bothered with, decides to find a nanny for his children, he winds up hiring a glamorous ex-circus pig who knows nothing about children but a lot about chocolate.

A flying pig's job is never done... With a runaway lion loose in the neighborhood, Derrick, Samantha, and Michael feel scared. Nanny Piggins feels like a slice of cake. And Boris feels like that lion looks strangely familiar... But if there was ever a pig who could tame both lion and lion tamer, it's Nanny Piggins! She also revolutionizes the sport of ski jumping, introduces hot-pink leotards to the local Neighborhood Watch, and demonstrates trapeze...