I have remarked that the paper had fallen away in parts. In this particular corner of the room a large piece had peeled off, leaving a yellow square of coarse plastering. Across this bare space there was scrawled in blood-red letters a single word—

RACHE.

“What do you think of that?” cried the detective, with the air of a showman exhibiting his show. “This was overlooked because it was in the darkest corner of the room, and no one thought of looking there. The murderer has written it with his or her own blood. See this smear where it has trickled down the wall! That disposes of the idea of suicide anyhow. Why was that corner chosen to write it on? I will tell you. See that candle on the mantelpiece. It was lit at the time, and if it was lit this corner would be the brightest instead of the darkest portion of the wall.”

“And what does it mean now that you have found it?” asked Gregson in a depreciatory voice.

“Mean? Why, it means that the writer was going to put the female name Rachel, but was disturbed before he or she had time to finish. You mark my words, when this case comes to be cleared up you will find that a woman named Rachel has something to do with it. It’s all very well for you to laugh, Mr. Sherlock Holmes. You may be very smart and clever, but the old hound is the best, when all is said and done.”

“I really beg your pardon!” said my companion, who had ruffled the little man’s temper by bursting into an explosion of laughter. “You certainly have the credit of being the first of us to find this out, and, as you say, it bears every mark of having been written by the other participant in last night’s mystery. I have not had time to examine this room yet, but with your permission I shall do so now.”