
While Holmes and Watson debate whether real life or fiction is stranger, they notice a woman hesitating across the street. Mary Sutherland has come with an extraordinary problem: on the morning of her wedding, her bridegroom vanished from the cab taking him to the church. Where did Hosmer Angel go?

In the Baker Street sitting room, Holmes and Watson debate whether reality is stranger than fiction. Their talk ranges over newspaper cases, royal gifts, and Holmes’s current consultations. Then Holmes notices a hesitant woman across the street. Mary Sutherland enters and begins by explaining her family circumstances and independent income.

Mary begins the story of meeting Hosmer Angel: the gasfitters’ ball she attended despite her stepfather’s objections, their walks, the daily letters, and their engagement. Holmes asks short, precise questions about the man’s office, home, manner, and appearance. At last her account reaches the morning arranged for the wedding.

After Mary leaves, Holmes asks Watson what he observed in her clothes and appearance. He explains the evidence in her sleeves, face, boots, and gloves, then turns to the documents she left behind: a newspaper advertisement and several typed letters. Before acting, Holmes decides to send two inquiries.

The following evening Watson hurries back to Baker Street, where Holmes has spent the day on a chemical experiment. James Windibank, Mary’s stepfather, arrives in response to Holmes’s letter. Unhappy that a private family matter has been taken outside the home, he sits down to hear what Holmes has discovered.