“At what address?”

“American Exchange, Strand — to be left till called for. They are both from the Guion Steamship Company, and refer to the sailing of their boats from Liverpool. It is clear that this unfortunate man was about to return to New York.”

“Have you made any inquiries as to this man Stangerson?”

“I did it at once, sir,” said Gregson. “I have had advertisements sent to all the newspapers, and one of my men has gone to the American Exchange, but he has not returned yet.”

“Have you sent to Cleveland?”

“We telegraphed this morning.”

“How did you word your inquiries?”

“We simply detailed the circumstances, and said that we should be glad of any information which could help us.”

“You did not ask for particulars on any point which appeared to you to be crucial?”

“I asked about Stangerson.”

“Nothing else? Is there no circumstance on which this whole case appears to hinge? Will you not telegraph again?”

“I have said all I have to say,” said Gregson, in an offended voice.

Sherlock Holmes chuckled to himself, and appeared to be about to make some remark, when Lestrade, who had been in in the front room while we were holding this conversation in the hall, reappeared upon the scene, rubbing his hands in a pompous and self-satisfied manner.

“Mr. Gregson,” he said, “I have just made a discovery of the highest importance, and one which would have been overlooked had I not made a careful examination of the walls.”

The little man’s eyes sparkled as he spoke, and he was evidently in a state of suppressed exultation at having scored a point against his colleague.

“Come here,” he said, bustling back into the room, the atmosphere of which felt clearer since the removal of its ghastly inmate. “Now, stand there!”

He struck a match on his boot and held it up against the wall.

“Look at that!” he said, triumphantly.

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.

‘You’re quite sure it’s all right for you?’

‘Perfectly all right.’

And again they were still. The launch twanged and hooted, somebody was singing. Then as if the night smashed, suddenly there was a great shout, a confusion of shouting, warring on the water, then the horrid noise of paddles reversed and churned violently.

Gerald sat up, and Gudrun looked at him in fear.

‘Somebody in the water,’ he said, angrily, and desperately, looking keenly across the dusk. ‘Can you row up?’

‘Where, to the launch?’ asked Gudrun, in nervous panic.

‘Yes.’

‘You’ll tell me if I don’t steer straight,’ she said, in nervous apprehension.

‘You keep pretty level,’ he said, and the canoe hastened forward.

The shouting and the noise continued, sounding horrid through the dusk, over the surface of the water.

‘Wasn’t this BOUND to happen?’ said Gudrun, with heavy hateful irony. But he hardly heard, and she glanced over her shoulder to see her way. The half–dark waters were sprinkled with lovely bubbles of swaying lights, the launch did not look far off. She was rocking her lights in the early night. Gudrun rowed as hard as she could. But now that it was a serious matter, she seemed uncertain and clumsy in her stroke, it was difficult to paddle swiftly. She glanced at his face. He was looking fixedly into the darkness, very keen and alert and single in himself, instrumental. Her heart sank, she seemed to die a death. ‘Of course,’ she said to herself, ‘nobody will be drowned. Of course they won’t. It would be too extravagant and sensational.’ But her heart was cold, because of his sharp impersonal face. It was as if he belonged naturally to dread and catastrophe, as if he were himself again.

Then there came a child’s voice, a girl’s high, piercing shriek:

‘Di—Di—Di—Di—Oh Di—Oh Di—Oh Di!’

The blood ran cold in Gudrun’s veins.

‘It’s Diana, is it,’ muttered Gerald. ‘The young monkey, she’d have to be up to some of her tricks.’

And he glanced again at the paddle, the boat was not going quickly enough for him. It made Gudrun almost helpless at the rowing, this nervous stress. She kept up with all her might. Still the voices were calling and answering.

‘Where, where? There you are—that’s it. Which? No—No–o–o. Damn it all, here, HERE—’ Boats were hurrying from all directions to the scene, coloured lanterns could be seen waving close to the surface of the lake, reflections swaying after them in uneven haste. The steamer hooted again, for some unknown reason. Gudrun’s boat was travelling quickly, the lanterns were swinging behind Gerald.

And then again came the child’s high, screaming voice, with a note of weeping and impatience in it now:

‘Di—Oh Di—Oh Di—Di—!’