The Paliser Case (1920)

Cassy Cara, daughter of a crippled violinist, earns a meager living by singing. She meets Keith Lennox, who is engaged to Margaret Austen, a society girl. When Margaret sees Cassy emerging from Lennox' apartment, the engagement is broken off. What Margaret does not know is that the pair were having a business meeting. Cassy sings at a formal party, and catches the eye of Monty Paliser, a wealthy but highly undesirable person. Cassy consents to marry him, to relieve her father's financial burdens. But then Cassy discovers she is the victim of a mock marriage ceremony. She tells Lennox what has happened. She also tells her father. Cassy plans to kill Paliser that night at the opera. Unknown to her, Lennox has developed a similar plan. That evening during the performance, Paliser is stabbed in the back. Lennox, who was seated in the box next to Paliser, is arrested, but Cassy confesses to the crime to save him. But the actual killer turns out to be Cassy's father, who had made his way to the opera house and committed the crime, unseen by anyone. He confesses, then dies of a heart attack. Cassy and Lennox find love together.