The Open Door.

Gilbert enters his house through an open door and discovers a young female thief stealing his jewels. He lets her go, but they are both caught by two accomplices: one posing as the homeowner and the other as a policeman. The impostors manacle Gilbert and the girl together and have them "marched away." The fake policeman then returns, announcing he "gave them the slip," and he and his partner prepare to flee. At this point, the real police arrive, led by Gilbert and the girl, and the two wily crooks are arrested. The story concludes on a romantic note, with the open door proving to be their "gateway to happiness" as love awakens between Gilbert and the lass.