As described in a film magazine, the Van Arsdale's come into sudden wealth and raise their naturally sweet and sentimental child Marcia (Joyce) into a beautiful and cultured woman who is cold and calculating and with a heart of ice. She becomes known in society as the girl who challenges any man to arouse sentiment in her. When bankruptcy threatens the family, they believe their only salvation is their daughter's marriage to a millionaire. Robert Jardine (Carleton) is the man they select. Robert believes he sees the woman beneath the shell of Marcia, and when she coldly tells him that she will marry him only for his wealth, he agrees on the condition that she "will a wife - and a mother." Marcia keeps her part of the marriage agreement, but apparently cares nothing for her own child. Gradually the spark of mother-love brightens, but she is ashamed of her show of sentiment. Then the child is kidnapped, and Marcia is fraught with the fears that only a mother can know, showing the real woman in her. Then her child is brought to her, and it turns out that the kidnapping being a "frame" on the part of her husband.
As described in a film magazine, John Burkett Ryder (Randolf), "the richest man in the world," seeks to discredit a judicial decision which works against his financial interests by discrediting its author, Judge Rossmore (Hallam), and has impeachment charges initiated against the judge in Congress. Shirley Rossmore (Joyce), the judge's daughter, learns of her father's trouble and returns from Paris, where she has won success as an author. She is loved by Jefferson Ryder (Nagel), son of the magnet. Determined to force the millionaire's hand, she publishes The American Octopus under a pseudonym with a main character based upon Burkett. He is attracted by the book and brings its author Shirley, whom he knows as Sarah Green, into his home to write his biography. She uses this opportunity as the chance to obtain two letters that will clear her father's name. John aids her in obtaining the documents, but is discovered and denounced as a thief. Shirley cannot allow the man she loves so branded, so she reveals her identity. The millionaire "lion" had already been won over by the charm of the "mouse," so there is a happy resolution.
Manuel Granado rediscovers a son he thought had died years before to see him engaged to the daughter of the bandit who had kidnapped the son and turned him into a matador.