TAMARAC, Fla. — What do you do 25 years after creating a new artistic genre? If you are Will Eisner, you do the same thing again in your late 80's. "A Contract With God," set in the tenements of his Bronx youth and published in 1978, established Mr. Eisner as the father of the graphic novel. Now he has taken the adult comic-book format a step further, with a graphic history that applies his dark, 1930's-style illustrations to real events of a century ago. This latest work, called "The Plot," tells the story behind the creation of "The Protocols of...