After years of struggling on the dime museum circuit, Harry Houdini got a break that put him on the front page of a Chicago newspaper. Soon Houdini was performing for royalty, commanding vast sums, and exploring the new power of Hollywood. At a time when spy agencies frequently co-opted amateurs, Houdini developed a relationship with a man who would later run MI-5. For the next several years, the world's most famous magician traveled to Germany and...