A man confesses to an FBI agent his family’s story of how his religious fanatic father’s visions lead to a series of murders to destroy supposed “demons.”

In the midst of World War II, the battle under the sea rages and the Nazis have the upper hand as the Allies are unable to crack their war codes. However, after a wrecked U-boat sends out an SOS signal, the Allies realise this is their chance to seize the ‘enigma coding machine’.