I just read Hitler's Holy Relics
by Sidney D. Kirkpatrick, published in 2010.
The book is subtitled "A True Story of Nazi Plunder and the Race to Recover the Crown Jewels
of the Holy Roman Empire".
I haven't seen it discussed here before, but it is in line with at least two of the
Indiana Jones films.
To his credit, the author does not mention Indiana Jones but the back cover descriptions do.
Kirkpatrick describes the efforts of German-born Walter Horn, a U.S. Army first lieutenant
and art historian, to locate the missing crown, orb, scepter, imperial sword, and ceremonial
sword of the Holy Roman Empire in Europe at the end of WWII.
The objects, along with the Holy Lance of Longinus (Spear of Destiny) and many other artifacts,
had been stolen by the Nazis from Austria after the Anschluss in 1938 and, conceivably,
could have been used by Nazis to motivate Germans in the creation of a Fourth Reich,
or to crown Hitler as a new Holy Roman Emperor.
There is lots of discussion about Nazi mystical beliefs and practices, especially those
involving Heinrich Himmler, the Reichsführer of the SS.
At one point Lt. Horn wonders about what would happen if Himmler met US General George Patton,
both of whom had occult interests.
At the end of the book, Lt. Horn recovers the Holy Roman Empire relics, is promoted to
Captain and given a Nazi bigwig's fancy car, and is sent to chase "Hitler's coin collection".
Supposedly Hitler's coin collection included some Roman gold coins, like this one:
Byzantine Justinian Solidus
Struck AD 527-537, Constantinople, 21mm, 4.43gm
Is Justinian holding the Holy Lance?
A really interesting book.