The Rings of Cagliostro

Arsène Lupin, disguised as Raoul d'Andrézy, travels to Vienna to attend a conference on treasures. At the home of wealthy Baron Ordosczy, the conference begins. Corcoran explains that the mysterious inscriptions engraved on 7 rings conceal the secret of Cagliostro's treasure. The light goes out. When it returns, the rings have disappeared.