"Wizard's First Rule" is the first book in the Sword of Truth series by Terry Goodkind. It follows the journey of a young woods guide named Richard Cypher as he discovers his destiny and the existence of magic in his world. He meets Kahlan Amnell, a powerful woman with a mysterious past, and Zeddicus Zu'l Zorander, a wise wizard who helps guide them. The story revolves around the struggle against the tyrannical ruler Darken Rahl, who seeks to control the world using dark magic. The central theme, known as the Wizard's First Rule, states that people are often manipulated by their beliefs, which can lead to dangerous consequences.