"The Riddle-Master Trilogy" is a fantasy series written by Patricia A. McKillip, consisting of three novels: "The Riddle-Master of Hed," "Heir of Sea and Fire," and "The Harp of the Grey Rose." The story follows Morgon, a young prince with a mysterious heritage, as he embarks on a quest to uncover his identity and fulfill his destiny. The series is known for its lyrical prose and intricate world-building. The narrative explores themes of identity, power, and the nature of riddles, intertwining magic and mythology. Key elements include the Riddle-Master, a figure who poses challenges through riddles, and the Harp of the Grey Rose, a significant artifact in the story. The trilogy is celebrated for its depth and imaginative storytelling.