“In the outhouse you will find a considerable quantity of straw,” said Holmes. “I will ask you to carry in two bundles of it. I think it will be of the greatest assistance in producing the witness whom I require. Thank you very much. I believe you have some matches in your pocket Watson. Now, Mr. Lestrade, I will ask you all to accompany me to the top landing.”

As I have said, there was a broad corridor there, which ran outside three empty bedrooms. At one end of the corridor we were all marshalled by Sherlock Holmes, the constables grinning and Lestrade staring at my friend with amazement, expectation, and derision chasing each other across his features. Holmes stood before us with the air of a conjurer who is performing a trick.

“Would you kindly send one of your constables for two buckets of water? Put the straw on the floor here, free from the wall on either side. Now I think that we are all ready.”