The Adventures of Sherlock Holmes - The Adventure of the Noble Bachelor
This case is about Lord St. Simon's marriage and his wife Hatty Doran's sudden disappearance after the wedding.
During the ceremony, Hatty was seen dropping her bouquet when walking down the aisle. A man picked it up and handed it back to her.
After the ceremony a woman, Flora Millan, caused a scene while they were walking into the wedding breakfast. Hatty wasn't there to witness the ruckus but she disappeared after excusing herself from the table.
Result: The man was her ex-fiance, Francis (Frank) Hay Moulton. They promised themselves to each other but he wanted to wait until he had money before getting married. He went off to make money and news came that he died at a miners' camp. When Frank appeared at the wedding, she felt that her duty was to Frank so she left to be with him.
After the reveal, Lord St. Simon left in anger.