On his brother's death, James Wilbur is appointed guardian of his niece Peggy. As his only child, his one thought was to insure her future happiness. A young man named William Bronson found favor in his estimation. His last wish was when Peggy was of age she should marry William. The uncle also approved of her father's choice. At her boarding school, Peggy, used to having her own way, is continually creating disorder and disturbing the discipline of the classes. Prank follows prank in rapid succession until her uncle is finally requested to take her out of the school. At home, Peggy refuses William's attentions, preferring to make her own choice. With the object of "settling" Peggy in life, Uncle James decrees that he will announce her engagement to William Bronson at her upcoming birthday party. To avoid it, Peggy informs her uncle that she is betrothed to "Mr. Stokes," and shows a photograph on the back of which she had one of her young men friends write, "To darling Peggy." This convinces the uncle that she is in earnest and he is furious. At her party, Richard Carson, a very much "wanted" crook, makes an entry and is almost successful in getting away with some "souvenirs" of the celebration when Peggy comes upon him unexpectedly and by a clever ruse commands him to "throw up your hands." Taken unawares, the thief obeys, and turning around, so frightens Peggy that she drops the improvised weapon, for he is no other than the man whose photograph she has used to put off the hateful engagement to Bronson. At this moment Bronson enters and recognizes Carson as the notorious thief, calls the police and they take charge of Peggy's late fiancé. Despite her willfulness, Peggy has long since experienced a change of heart, and her engagement is duly announced as her uncle intended.
—Moving Picture World synopsis