"The Magical Mimics in Oz" by Jack Snow is a novel published in 1946. When Princess Ozma and Glinda leave to attend a fairy council, Dorothy is appointed to rule Oz in their absence. But evil shape-shifting creatures called Mimics launch a sinister plot, with their rulers stealing the forms of Dorothy and the Wizard by stepping into their shadows. As the Mimics infiltrate Oz disguised as beautiful birds, the paralyzed heroes must escape their mountain prison and stop the invasion before Oz falls to these malevolent imposters. (This is an automatically generated summary.)