- Richard De La Croix has a brother, Andreas, who has been driven insane by a notorious vamp and socialite named Sappho. A man-about-town named Teddy takes Richard to the Odeon to meet her, but when Sappho actually meets Richard, he is unaware that she is the woman who drove Andreas insane.—Ulf Kjell Gür
- Andreas de la Croix is madly in love with Sappho. But she is also seeing his employer, wealthy George Bertink. She soon tires of Andreas. Her indifference towards him drives him insane. His brother Richard goes to a café with his friend Teddy, hoping to forget his brother's fate. When Richard is asked to toast a dancer at the café, he curses all womanhood. Sappho enters the café and hears Richard's outburst. Her interest is piqued, and she manages to engage him in conversation. Bertink orders her away from Richard. But Sappho, falling for Richard, asks him to escort her home. There, Sappho attempts to work her charms on Richard, but is surprised by his coldness. He then tells her about his brother. Sappho is determined to keep her past a secret. Bertink threatens to tell Richard the truth about Sappho, so she allows Bertink to keep seeing her. Richard and Sappho go to a seaside hotel. Bertink, mad with jealousy, tracks them down and tells Richard the truth about Sappho. Disillusioned, Richard goes to his fiancée, Maria Garden, and quickly marries her. During the wedding breakfast, Richard is plagued with thoughts of Sappho. He leaves his bride and the wedding guests and takes a train to find her. Meanwhile, Andreas escapes from the asylum after killing his guard. Sappho, learning of Richard's marriage, sets out for the great annual fancy dress ball. At the theater box, she makes a show of gaiety to mask her depressed mood at losing Richard. Richard arrives at the theater, and the pair flee up two flights of stairs into a private dining room, where they profess their love. Andreas, walking blindly around the city, encounters Bertink in his limousine, who is on his way to the ball. Andreas murders him, and learns that Sappho is to be crowned a queen at the ball. He reaches the theater, and opens the door to the private box. He shoves Richard out of the room. Richard beats wildly at the door, shouting for help. When the door is broken down, Sappho lies dead at Andreas' feet.
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