Well, I thought as you do," said Lestrade. "On the other hand, this Morse Hudson is the purveyor of busts in that part of London, and these three were the only ones which had been in his shop for years. So, although, as you say, there are many hundreds of statues in London, it is very probable that these three were the only ones in that district. Therefore, a local fanatic would begin with them. What do you think, Dr. Watson?"

"There are no limits to the possibilities of monomania," I answered. "There is the condition which the modern French psychologists have called the "idee fixe," which may be trifling in character, and accompanied by complete sanity in every other way. A man who had read deeply about Napoleon, or who had possibly received some hereditary family injury through the great war, might conceivably form such an idee fixe and under its influence be capable of any fantastic outrage."

"That won't do, my dear Watson," said Holmes, shaking his head, "for no amount of idee fixe would enable your interesting monomaniac to find out where these busts were situated."

"Well, how do you explain it?"