Jim Jenkins is jealous of his wife, Clara, and she cannot even smile on a man that he does not go up in the air so high that he bumps the moon out of place. Even the post man comes under suspicion, and when he steals back to the house and finds a man on his knees before Clara, and in her bedroom at that, he is ready to do murder. Clara pulls her husband off the unfortunate and explains that he is the upholsterer tacking down the carpet, and Jim is quiet for a moment. But on his way to the office a friend shows him a pair of opera glasses. Naturally Jim trains them on his home and there is another man on his knees before Clara out on the back stoop where all the neighbors can see. It's enough. He starts for home in a hurry, and finds it was the grocery boy who had knelt to tie his shoe string. He knows it's the grocery boy because the kid bangs him on the head with a bag of flour and the bag bursts, sprinkling Jim liberally. This time he actually gets to the office, but he is uneasy. Suspicion gnaws at his vitals and he starts for home. There in the window he sees a man with his arm about his wife's waist; he doesn't stop to inquire; he shoots to kill, and it is a mighty good thing for the girl next door, who is masquerading in her brother's clothes, that rage makes Jim's aim unsteady. Maude's brother and sweetheart hear the shots and run to see what it is about. They arrange a scheme with a prizefighter to cure Jim of his jealousy, which ends very successfully.