"When the most powerful artillery, deadly bacteria and explosives known, and the most destructive methods available fail to be effective against some enemy's unknown weapon of war, it is time, very frequently, to turn to some simple means of combat and attack. Paradoxically, though, it is the simple thing that is so difficult to hit upon…" 'The Metal Monster' is a science fiction novel about a journey into the earth's core and the startling discovery that the expeditioners make about strange creatures they find there.