Tim Willows, the athletic mainspring of the Manning, Willows and Claire advertising agency, and his indolent wife Sally continually bicker under the watchful eye of Mr. Ram, an Indian idol given to them by a distant relative. After a day in which Tim carries on his business at breakneck speed while Sally lolls in bed and bath, they quarrel and express a mutual wish to change places. Hearing their desire, Mr. Ram begins to speak and pronounces that their wish will be granted. The next morning, Tim and Sally awake to find their personalities, voices and mannerisms transplanted in the other's body. Athletic Tim, in the body of Sally, stays home and creates consternation among the house servants and wives of his business partners, while Sally, in the body of Tim, goes off to the office and creates confusion among the staff, estranges Julian Marlowe, the agency's key client, and scores a success with the effiminate client that Tim had been barring from his office. When Sally returns home from her day at the office, the couple beg Mr. Ram for relief and are seemingly restored to their original sexes and personalities. Using Sally's pregnancy as an excuse for their strange behavior, they then set about wooing back the clients and friends whom they have alienated. However, just when it seems that things have returned to normal, Mr. Ram realizes that he has made a grave mistake in his transposition, and reveals that it is Tim who is going to give birth to the baby.