In this poignant, magical tale by the acclaimed author of Eventown, two girls find themselves dropped into each other's world--and must face down dragons they've only imagined. Auden "Denny" Greene is happiest with her friend Runa, creating stories set in their imaginary land of Sorrowfeld, where princesses rule and cursed dragons are a constant danger. But now that they are turning twelve, Runa seems ready to give up on the magic of Sorrowfeld just when Denny needs it the most. Princess Auden is the last remaining princess of Sorrowfeld--and on her twelfth birthday, she will be expected to vanquish the dragons that took her family. Only, when a swarm attacks her birthday celebration, all she can do is run. But suddenly. Auden is in Denny's world. And Denny is in Auden's.

The two Audens have switched places. No one but them has any idea. And now, each girl must come into her own power in order to fight the other's dragons. The magical beasts of Impossible Creatures meet the body-swap of Freaky Friday, set in a world as fantastical as Wicked's Oz!.