On a street car one evening, Tabitha Martin, a somewhat corpulent woman, seats herself next to Harry Prettyman, a decidedly fat man, who is reading the paper. She looks over his shoulder and notices the advertisement of Mme. Milo, who guarantees to reduce your weight in a short time. Henry notices her copying the address and he does so also, intending to make inquiries about the matter. Prettyman is a clerk in the same office as Jack Martin, Tabitha’s husband, but does not know who the lady is. Henry and Tabitha meet again that evening at Mme. Milo’s physical-culture school, when both make appointments to turn up for a cross-country run the next afternoon. Next day Henry gets away from the office by feigning sickness and makes his way to Mme. Milo’s. Jack Martin also gets off and follows Henry to see what the game is. To his great astonishment, he sees both Henry and his wife Tabitha enter what is apparently a private house, and determines that he will set a watch and learn more of the affair. Henry’s arrival at the house is also seen by his wife. Mabel, who has become suspicious on finding a strange address and the card of appointment in her husband’s overcoat pocket, and fears a possible rival in his affections. That evening Tabitha and Henry both refuse to tell their spouses anything about the events of the day and the next night they slip away from their respective houses to attend a lecture by Mme. Milo. Jack and Mabel both become suspicious and go along to the house. There they see Henry and Tabitha talking together and they make trouble. Jack rushes at Henry while Mabel attempts to make mincemeat out of Tabitha. Mme. Milo comes between them and explanations are soon made. Jack and Mabel are appeased when they bear that Mme. Milo’s is only a flesh-reducing establishment and all four go off to enjoy a little supper together. Henry and Tabitha both decide that they are satisfied with their present size and start eating sweets once more, a luxury which had been strictly tabooed by the physical culture expert.