“Ah, you must give us a little time,” said Holmes good-humoredly.

“You’ll want it,” said young Alec Cunningham. “Why, I don’t see that we have any clue at all.”

“There’s only one,” answered the Inspector. “We thought that if we could only find⁠—Good heavens, Mr. Holmes! What is the matter?”

My poor friend’s face had suddenly assumed the most dreadful expression. His eyes rolled upwards, his features writhed in agony, and with a suppressed groan he dropped on his face upon the ground. Horrified at the suddenness and severity of the attack, we carried him into the kitchen, where he lay back in a large chair, and breathed heavily for some minutes. Finally, with a shamefaced apology for his weakness, he rose once more.

“Watson would tell you that I have only just recovered from a severe illness,” he explained. “I am liable to these sudden nervous attacks.”