The Unknown Purple (1923)

Inventor Peter Marchmont has discovered a purple light that renders the user invisible On his release from prison Marchmont disguised as Victor Cromport uses the light to revenge himself against his former wife Jewel and her partner James Dawson who framed him for theft Making himself invisible Marchmont gradually ruins Dawson He so wins Jewels confidence and love that she is willing to kill Dawson at Marchmonts request Finally Marchmont leaves the scheming couple to their own misery and marries Jewels sister Ruth Marsh