Iron hearted Violet
"Princess Violet is the complete opposite of most fairy-tale princesses -- plain, adventurous, and quite possibly too clever for her own good. One day, while exploring her castle, Violet and her best friend, Demetrius, stumble upon a hidden passage, which leads to a secret room, which houses a peculiar book, which tells a story that has long been forbidden. A story about an evil being trapped in their world. Violet, Demetrius, and the King's cowardly dragon might just be the key to its escape -- or demise"--
