Mr. Mason is extremely jealous of his wife, and even carries his jealousy to the extent of begrudging the baby and the dog his wife's passing attentions. However, he swallows his rage until one afternoon he takes his wife for a row on the lake and while they are enjoying themselves, a friend, Miss James, goes for a horseback ride. Her horse becomes frightened at a hunter's shot and runs away. She finds herself forced to walk home in her riding costume, consisting of a jacket and trousers. Her humiliation is great when she finds herself laughed at by the men she passes, and upon seeing her friend, Mrs. Mason, she pleads for assistance, and is invited to accompany her across the lake to her home, where she can secure a dress. Mr. Mason, awakening from a nap, sees what he thinks to be a handsome young man in the boat with his wife, and he chases along the shore after them in a jealous rage. Mrs. Mason and her friend reach the temporary safety of her boudoir, where Mrs. Mason is going to lend her friend a dress. Her husband followed them, however, and frantic, demands admission to the room. Miss James hides in a closet and the husband enters. He demands to know the biding place of the chap he thought he saw disguising himself when he peeped through the keyhole before going into the room. Securing a revolver he demands that the man step out of the closet, and to his surprise and astonishment he finds himself face to face with a pretty young miss.
—Moving Picture World synopsis