Otto calls on his sweetheart Zelda, who is very anxious to get married. He sees an advertisement in the paper, answers it, and gets a position as janitor in an apartment house belonging to Mr. Ongley. No sooner does Otto begin his labors, when something goes wrong in every flat in the building, and Otto is called upon to fix the trouble. One of the tenants leaves her baby in charge of Otto while she goes shopping, and Zelda, calling later to see how Otto is getting along, discovers him with the child. She immediately becomes suspicious of Otto and thinks that the child is his. The belief is further strengthened when the mother of the child returns and demands her child. Otto has a hard time convincing Zelda that he was only the baby's guardian, but finally succeeds. After a series of amusing incidents. Otto is fixing the furnace in the cellar when the boiler explodes. He is taken to the hospital, where he is married to Zelda.