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This is a rare story in the voice of Sherlock Holmes, not his biographer Dr Watson. Holmes tells us that he has retired from all his work and gone to rest in his house in Sussex.

On the beach, the detective meets his friend Harold Stackhurst, who was the headmaster of the school. Stackhurst tells him that he is waiting for Fitzroy Macpherson, the school's science teacher. A few minutes later, McPherson appears in the distance and falls to the ground staggering as if drunk. Holmes and Stackhurst run to his aid, but Macpherson dies quickly, and before he dies, he utters the words "lion's mane". Numerous long crimson wounds are found on his body, as if from whiplash.