Mae Murray stars here as twin sisters separated at birth. One grows up in poverty while the other lives like a princess. Enter the bad man. When John Bent (Warner Oland) stumbles across Daisy (Murray) and her dying mother, he here the old lady babbling about important papers and money. He grabs the papers as the woman dies and discovers that Daisy is really the daughter of a wealthy industrialist.
He packs Daisy off to a boarding school and descends on the rich man with the papers but stating that Daisy had died. The rich man, impressed at Oland's honesty, offers him a job and takes him into the family which includes Violet (Murray) and his chief engineer who is in love with Violet.
After the father is injured in a lab explosion, Oland pressures the dying man to force Violet to marry him. The old man concedes and Oland marries Murray. But she refuses to be his wife.
Oland next drugs Violet and takes her rings just before picking up Daisy from her school. Daisy has the same heart condition her mother had, so Oland frightens her to death and places the wedding rings on her dead hand and passes her off as Violet! Next up, he convinces some doctors that the real Violet is Daisy and that she had gone insane. Murray goes nuts trying to convince the stupid doctors, who immediately commit her to an asylum. Bent inherits the family fortune and business.
From the asylum, Violet is able to sneak a letter to her engineer boyfriend who comes to her rescue. But are they too late to stop Oland? Will anyone believe Murray is really Violet the heiress? Plot is loosely based on "The Woman in White" by Wilkie Collins and offer both Murray and Oland meaty roles in a rather far-fetched plot. Productions values are excellent, and the last third of the film is really exciting and action packed. The film has existed in a Dutch archive for many years and was recently translated into English.