American newspaper reporter Jim Crocker's madcap escapades in London earn him notoriety and the nickname "Piccadilly Jim." When he overhears his American cousin by marriage, Ann Chester, giving her candid opinion of him, he decides to return to America to try to reform. He meets Ann on the boat, using another name. Unable to find work in New York, he goes to his step aunt Mrs. Peter Pett's home to be near Ann. Jim then helps Ann kidnap pampered cousin Ogden Pett whose overindulgence has created disruption in the household.
