The Flash of Fate (1918)

When his father commits suicide after being ruined by dishonest stockbroker Abner Hinman, Randolph Shorb resolves to gain revenge and rebuild his fortune by whatever means necessary. With the aid of notorious crook Philadelphia Johnson, Randolph becomes the head of a gang of thieves and is thereafter known as The Ferret. Joe Freeman, the brother of Randolph's girlfriend Mary, moves to the city, where he is robbed by Johnson and forced to hold up a bank. Mary learns of Joe's troubles and rushes to the city to help him but is lured to a rooming house and attacked by Johnson. Joe disappears with the intention of committing suicide, after which Randolph, frantic over both Joe and Mary, goes to the power house and flashes a message in Morse code over all of the city's electric lights. Through his message, Joe regains hope and Mary is rescued. After the gang's arrest, Randolph vows to lead an honest life.