The Bigamist by Ethel Mills

It was the fifth anniversary of the Arnott's wedding, and Arnott had presented his wife with the customary present of jewellery: on this occasion it took the form of a rope of pearls. Pamela wore the pearls at the anniversary dinner, which function also had become a custom. It was the one entertainment during the year to which Pamela limited her invitations to the guests she especially liked; and with her careful selection was also particular in limiting the numbers. On this day, if on no other, she informed her husband, she insisted upon enjoying herself.

Arnott was quite satisfied to leave the arrangements to her; and it often transpired that he did not know who his guests were to be until they arrived. But on the day in question he did an entirely unforeseen thing, and astonished Pamela with the announcement -- made while drinking tea on the stoep, and eating wedding-cake, which Pamela considered indispensable to the day -- that he had met a man in town he knew and had asked him to dine.