We had breakfasted and were smoking our morning pipe on the day after the remarkable experience which I have recorded, when Mr. Lestrade, of Scotland Yard, very solemn and impressive, was ushered into our modest sitting-room.

“Good morning, Mr. Holmes,” said he; “good morning. May I ask if you are very busy just now?”

“Not too busy to listen to you.”

“I thought that, perhaps, if you had nothing particular on hand, you might care to assist us in a most remarkable case, which occurred only last night at Hampstead.”

“Dear me!” said Holmes. “What was that?”