Freedman's plot begins with two little girls, Rebecca and Shoshanna, seven and three years old respectively. While playing by a stream near their Oregon home, the girls see a little frog that shows beckoning behavior — calling to them, moving away, then waiting for them to follow. And naturally, they do. The frog leads them to a gem-encrusted golden dishpan, which magically transports the girls (and frog) to Oz.
Once in Oz, the children learn that the land has been infiltrated and subverted by Magicians of Mischief. The girls make some Ozian friends, including King Randy of Regalia, Planetty the Silver Princess, and her Thundercolt Thun; the little frog who led them to Oz turns out to be the Frogman in enchanted form. Together, the girls and their helpers manage to defeat the Magicians and restore the proper order of Oz.
Regarding the previous Oz literature, Freedman draws upon two books in particular, Baum's The Lost Princess of Oz (1917) and Thompson's The Silver Princess in Oz (1938). The dishpan comes from the first book, as does the Frogman; the dishpan's owner, Cayke the cookie cook, makes a brief appearance too.