Columbia subject headings:
British--Middle East--Drama.
Germans--Middle East--Drama.
Historical drama.
Nibelungen--Drama.
Orient Express (Express train)--Drama.
World War, 1914-1918--Secret service--Germany--Drama.
World War, 1914-1918--Secret service--Great Britain--Drama.
Harvard subject headings:
Princeton subject headings:
British--Middle East--Drama.
Drama.
Germans--Middle East--Drama.
Nibelungen--Drama.
Orient Express (Express train)--Drama.
World War, 1914-1918--Secret service--Germany--Drama.
World War, 1914-1918--Secret service--Great Britain--Drama.