"Cadvan of Lune" is a fantasy novel written by Juliet Marillier. It is part of the Tales of the Five Hundred Kingdoms series, which explores themes of magic, adventure, and the struggle between good and evil. The story follows the journey of Cadvan, a skilled mage, as he navigates a world filled with mythical creatures and ancient prophecies. The novel features rich world-building and character development, showcasing the relationships between Cadvan and other key characters, including Aisling, a young woman with a mysterious past. Together, they face challenges that test their courage and loyalty, ultimately leading to a deeper understanding of their destinies.