Eisenheim is a fictional character from the novel "The Prestige" by Christopher Priest. He is a magician in early 20th-century Vienna, known for his extraordinary illusions and performances that captivate audiences. Eisenheim's character explores themes of love, obsession, and the nature of reality. In the story, Eisenheim becomes entangled with Sophie, a woman from his past, and faces off against a skeptical magician named Robert Angier. The narrative delves into the rivalry between magicians and the lengths they go to achieve greatness, ultimately questioning the boundaries between magic and reality.