Don gains access to the mysterious diary of a former SS officer. Its dark clues lead him to a perilous cave built to hide supernatural relics and a crypt where the Nazis held occult ceremonies in an attempt to conquer the world through black magic.

Don investigates reports of bizarre cult activity in the Louisiana bayou. He joins in an exorcism to ward off evil, seeks out ghostly orbs said to guard long-lost treasures and hunts for a demonic beast in the murky wetlands near New Orleans.