Deep in the ancient catacombs beneath an old Scottish abbey lie the gateway to a dark dimension. The monks have kept it secret for centuries. Their pagan forebearers have guarded it for millennia. Its origin stretches back to a forgotten age before recorded history. But now the seal has been broken and it is up to archaeology professor Mortimer Korrigan to learn its secrets. The monks say it is an entrance to hell itself. Professor Korrigan is convinced it is something far worse.