Queen of the Quantum Realm by Rhonda Denise Johnson: An interesting mix of unconventional elements
This is Book 1 of the Nanosia series, and it tells the story of a fourteen-year old called Jawan, who was taken away from his family eight years ago and was now the apprentice of a mage in a city called Hadley Town. However, a purple plague starts tearing the city apart and neither can find the reason behind it, which prompts Jawan to start his own search, leading to the small, small world of the Quantum Realm.
