The Sealed Envelope(1919)

Peter James Slaney, just released from prison, is the only boarder who is kind to Lena, the maid at the cheap Paris Hotel. So that Lena can leave her abusive landlady, Slaney accepts $2,500 from a stranger, who threatens to send Slaney back to prison unless he undertakes a job. Slaney is sent to the home of political boss John Biggs with a sealed envelope which he is to open after entering.