The Final Judgment (1915)

Actress Jane Carleson has three admirers: Henry Strong (a millionaire), Hamilton Ross (a chemist), and Murray Campbell (a district attorney). When Jane weds Campbell, Ross writes an anonymous letter to Campbell, warning him that Strong is after his wife. Ross smears the flap of the envelope with poison. However, Strong is the one who opens the envelope, and dies from the poison. Since Campbell and Strong had quarreled just before the arrival of the letter, Campbell is convicted of the murder. Jane must expose the true murderer and save her husband.