Underground tackles unusual topics for comic books. In Marion, KY, investors want to develop the federally-protected Stillwater Cave into a tourist trap. After park rangers Wesley Fischer -- caver and ardent protector of the Stillwater site -- and Seth Ridge confront locals blasting the cave, events quickly spiral into a deadly chase deep under the Kentucky mountains. Believable and likable characters propel this fast moving tale. Parker presents the separate viewpoints of the factions in an informed manner while successfully maintaining Fischer as the sympathetic protagonist. Lieber's excellent storytelling and vibrant art really shines, especially in the tense underground chase scenes, where he expertly combines peril with wonder. ( )