 And that's the whole story, Mr. Holmes, as far as it goes. Oh, well, it's curious, certainly. Now, Watson, come, pray give us your diagnosis. There are no limits, my dear Holmes, to the possibilities of monomania. A man who'd read deeply about Napoleon, for example, or a man who'd received some hereditary family injury through the Peninsular War, for instance. I mean, a man like that very well might conceive some kind of obsession.