A gangster, thief of atomic formulas, has a double in the person of a naive musician. A music hall artist who makes eyes at the musician is deceived by the gangster who also takes advantage of the resemblance to track down a band of thugs who are chasing him. Virtue is ultimately rewarded.
Toni / Placido
Zaza
Violinist
Maître d'hôtel
Jim
Gangster
Sainclair
Maître d'hôtel
Hotel manager
Policeman
Impresario
Director
The Egyptian
Old lady
Comedian
Comedian
Joe
Stage manager (uncredited)
Maître d'hôtel (uncredited)