On a cruise ship, there is a betting pool each day where guests try to correctly guess the amount of miles that the ship will travel each day, within ten miles above or below the captain's own guess. Guests can also choose "low field" or "high field," those being any amount more than ten above or ten below. On one particularly stormy day, a guest named Mr. Botibol bids two hundred pounds on "low field", hoping that the storms will significantly slow down the ship. He is gambling largely with money he doesn't have (it represents years of his and his wife's savings), but he views it as worth the risk.
The next morning, he awakes to find that the skies are clear and the ship is moving very fast to make up for lost time. Distraught, he decides that to slow down the ship, he will jump off into the water--this way, they will have to stop and turn around to rescue him. The count of miles for each day ends at noon.
Seeking out potential eyewitnesses, Mr. Botibol ventures to the rear of the ship where he encounters a single, rather large middle-aged woman. Striking up casual conversation with her (in order to ensure that she notices him, and therefore, when he falls into the water), he then surreptitiously leaps off the end of the ship. Yelling "Help, Help!" as he plunges into the water beneath him, he captures the attention of the woman, but, initially, she seems unable about how to react, and eventually relaxes and watches as the bobbing head of Mr. Botibol, arms waving madly, disappears into the horizon.
A thin, commanding, matronly woman arrives on the same deck, and reprimands the larger woman that was there previously. The bony woman states that she has been looking for the larger woman for quite a while, and scolds her for wandering off. The larger woman doesn't reply, but instead remarks offhandedly about a man that "dived overboard...with all his clothes on", a comment that earns a stern "Nonsense!" from the motherly lady. The last scene is that of the young woman "allowing herself to be led away across the deck", leaving the reader with the impression that the larger woman may be mentally handicapped or have some mental condition such as autism.