A celebrated Nazi general who plots Hitler's assassination. A sunken U-boat that mysteriously vanishes. An Alpine Fortress that may house millions in lost Nazi gold. Decades after World War II, there are still many Secrets of the Third Reich unfolding. We go into the minds of some of the conflict's most prominent events and notorious figures, and uncover the little-known stories that played a large role in determining the fate of the WWII and those who fought in it.