Long before Superman or Batman made their first appearances, there was Zorro. Born on the pages of the pulps in 1919, Zorro fenced his way through the American popular imagination, carving his signature letter Z into the flesh of evildoers in Old Spanish California. Zorro is the original caped crusader, the first hero to have a band called the Avengers, and the character who laid the blueprint for the modern American superhero. In Zorro's Shadow,...