Blackbone by George E Simpson

ll the security on Earth couldn't keep evil from entering Blackbone prison. But could anything keep it from breaking out?Ringed by gun towers an barbed wire, isolated by thousand miles of friged Montana wilderness, the prison on Blackbone Mountain was one of the best kept secrets of WWII...a maximum security camp where German POWs shivered under the eyes of bored American guards-and waited.Some waited for the war to end.Some yearned for an impossible Nazi victory.But one waited for teh sonsummation of an evil older than this war or any other..for a reign of slaughter that would never end, no matter ho many died in screaming terror...for a power no prison could no longer contain-not even Blackbone faultless for everyday use. superior materials and excellent craftsmanship ensure long-lasting durability.