The story entails the bride of the fictional Lord St. Simon disappearing on the day of their marriage.
The events of the wedding day are most perplexing to Lord St. Simon, as it seemed to him that his bride, Miss Hatty Doran of San Francisco, was full of enthusiasm about their impending marriage. Lord St. Simon tells Holmes that he noticed a change in the young lady's mood just after the wedding ceremony. She was uncharacteristically sharp with him. The only obvious happening at the church where the wedding took place that was out of the ordinary was Hatty's little accident: She dropped her wedding bouquet and a gentleman in the front pew picked it up and handed it back to her.
A short time later, at the wedding breakfast, before the newlyweds arrived, a former companion of St. Simon, Flora Millar, caused a disturbance at the house, and was ejected. After Lord St. Simon's and Hatty's arrival, Hatty was seen talking to her maid, and a short time later, it was realized that she had left.