Rinkitink, a plump, jolly fellow, and his grouchy goat Bilbil assist Inga, the crown prince of Pingaree, in reclaiming his lost kingdom from invaders. Inga is helped in his efforts by three magic pearls: one, blue, giving him superhuman strength; one, pink, protecting him from harm; and one, white, providing him with words of wisdom. But when the pearls are lost, can Queen Ozma, watching events on her magic mirror, save the day?

The 10th in the Oz books series, it was adapted from an original, non-Oz fantasy novel by L. Frank Baum.