Neon's Secret Universe by Sibéal Pounder introduces readers to the true nature of unicorns, powerful magical beings that look just like humans, living in a hidden realm called the Universe. The story follows a young girl named Neon Gallup who discovers an old lipstick that acts as a portal opener to the Universe. Neon's discovery leads her into a whimsical world filled with magic and endless possibilities, but also puts her in the position of guarding a significant magical secret.