What is the problem for the book the magicians elephant?

In "The Magician's Elephant" by Kate DiCamillo, the central problem revolves around the protagonist, Peter, who is searching for a way to find his long-lost sister, whom he believes is still alive. His quest is complicated by a mysterious elephant that appears in his life after a magician's spell, leading him to confront themes of hope, belief, and the unexpected connections that shape our lives. The story explores the challenges of faith, the pursuit of dreams, and the importance of compassion in overcoming obstacles.