SUBTERRANEAN SCOURGE by Brant House From the very air itself came that strange and ghastly death. It seemed to be everywhere, wearing a weird pattern of terror. Barricaded doors could not keep it out. The brains and bullets of the law could not combat it. Only one man fought to trace it to its horror home. And that man was Secret Agent X. But Agent X was checkmated by the one he loved best.