Rawley, a promoter, endeavors to obtain the plans of an invention which Conrey has made but without success. He then resorts to underhand methods and succeeds in establishing his confederate, Mark Hunter, in the Conrey household. Mark finds his early efforts frustrated, when he attempts to gain possession of the coveted plans, and he determines to pay ardent court to Gladys, Conrey's charming daughter, hoping to have more liberty in the house. Floyd, Gladys' lover, sees the couple together and when the young woman notices that she is being watched, she decides to make Floyd jealous and pretends to listen to Hunter's words of love. Floyd, concluding Gladys no longer cares for him, prepares to leave the neighborhood. Through the carelessness of the inventor, the Conrey workshop is set on fire. There is a general rush to extinguish the blaze and Hunter, seeing his opportunity, enters the house and makes away with the plans. Just at that time Floyd passes, and surmising what has taken place, follows in pursuit. Returning from the fire, Conrey receives a liberal offer for his invention, only to find that his valuable plans have disappeared. He and his family are at a loss what to do when Floyd and an officer return with the two criminals and deliver the valuable papers. Gladys, who is now quite repentant of her folly, makes things clear to Floyd and all ends happily.
—Moving Picture World synopsis