Ames is ill, apparently, and his physician advises him to take outdoor exercise. He retires to his country home, and, giving his gardener a holiday, he proceeds to do the man's work. Next door, a new family have moved in, a husband and wife, little girl, and the husband's charming sister. Bessie, the sister, mistakes Ames for a hired man and Ames humors her along, and thus plays a joke upon her. To get even with him, Bessie leads him to think that she is her brother's wife and the mother of the little girl. This leads to the most romantic complications, especially when the child succeeds in locking Ames and Bessie in the library on the second floor of Ames' house, and sends the only key to the door up into the air tied to a bunch of toy balloons. Poor Ames tries to make a martyr of himself, but is not permitted, and to his joy, suddenly finds himself possessed of a blushing, but rather mischievous little bride-to-be.
—Moving Picture World synopsis