There is no comparable novel or author. The novel,
Under the Purple Sky, is a mixture of:
- For Youth, CS Lewis, The Narnia Chronicles (otherworldly fantasy adventure)
- Madeleine L’Engle, A Wrinkle in Time (imaginative, with stronger Biblical emphasis)
- Jonathan Cahn, The Oracle (Jewish parable style, teacher/student dialogues, with a Messianic Jewish perspective)
- Frank Peretti, This Present Darkness (with some supernatural elements, spiritual warfare, and demonic characters)
- George Orwell, 1984 (a world with mass surveillance)
Some people would call this mixture of different genres “Speculative Fiction.”