The ideas of my friend Watson, though limited, are exceedingly pertinacious. For a long time he has worried me to write an experience of my own. Perhaps I have rather invited this persecution, since I have often had occasion to point out to him how superficial are his own accounts and to accuse him of pandering to popular taste instead of confining himself rigidly to facts and figures. "Try it yourself, Holmes!" he has retorted, and I am compelled to admit that, having taken my pen in my hand, I do begin to realize that the matter must be presented in such a way as may interest the reader.

Sherlock Holmes investigates the sudden change in behavior of a notable college professor who is about to marry a much younger lady.