human
How do you know it is the key? and where did you get it from?
gpt
Question No. 2 first, as to where I got it. When the late Donald Lindsay was seized with that most unfortunate stroke I assisted in undressing him; afterwards I folded up his clothes and put them away, and, in the ordinary course of my duty, I examined the pockets. In a small and ingeniously placed pocket inside his waistcoat--which the commonplace searcher would have overlooked--I found this key, secreted. That set me thinking. You will observe that on the tiny ring to which it is attached there is a number. When I learnt certain facts I caused inquiries to be made of a firm which I happen to know manufactures keys like this, asking how long it would take them to make Mr. Joseph Oldfield a duplicate key to his fiat in Bloomsbury Mansions, quoting this number. They replied to the effect that they could let him have another key in four-and-twenty hours; so that's how I know that this is the key to the flat in Bloomsbury Mansions.
human
You've a roundabout way of your own of finding out things.
gpt
Roundabout ways are sometimes the shortest, and the safest. Now, my dear Nash, you and I are going together to Bloomsbury Mansions; you will be the bearer of the key; you will show the key to the porter who we shall probably find there; you will tell him that you are Mr. Oldfield's solicitor--which you are; let us keep to the strict and literal truth; he will say 'Walk in!' and, when we have walked in, I think that the rest you can leave to me.