“Well, then, spend the next twenty-four hours in an intensive study of Chinese pottery.”

He gave no explanations and I asked for none. By long experience I had learned the wisdom of obedience. But when I had left his room I walked down Baker Street, revolving in my head how on earth I was to carry out so strange an order. Finally I drove to the London Library in St. James’s Square, put the matter to my friend Lomax, the sublibrarian, and departed to my rooms with a goodly volume under my arm.