Tragedy at the Royal Circus

In the Circus Royal, the young artists Ziska, Armand, Frank and their mentor Atto perform the aerial sensation "Ghosts of the Night" every day in front of an enthusiastic crowd. Armand is in love with Ziska. When she rejects him because she loves only Frank, Armand throws himself from the trapeze and dies. A mysterious inventor, Dr. Magirus, constructs a radio-mechanical human puppet, who is supposed to replace Armand in the act.