Sis graduates with high honors from the correspondence school in "detecting" and sets out for the city with Chauncey, the hired-man, to become rich. She arrives in time to take a hand in solving the mysterious disappearance of the dill pickle magnate's daughter. Sis manages to blunder into finding the daughter, and sends Chauncey back after Rockgold, and the reward. While standing guard over Jane and Jack, who she thinks is the kidnapper, Sis learns that they were really eloping. The spirit of romance is kindled, and when Rockgold arrives Sis refuses the reward and holds the irate father at bay while Jane and Jack continue their interrupted elopement.
—Moving Picture World synopsis