Faceless foes bookend the stories in Dick Tracy Volume 4, the latest entry in the Clover Press/Library of American Comics reissue of the original six Dick Tracy volumes in the larger format that became the series standard. The intrepid detective and his friends tackle invisible enemies when they square off against the notorious Purple Cross Gang and their masked leader. Later, Tracy and Pat Patton come to grips - and blows - with The Blank, whose...