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 more complex case had come to him in all the long series of his sensational investigations. I prayed, as I walked back along the grey, lonely road, that my friend might soon be freed from his preoccupations and able to come down to take this heavy burden of responsibility from my shoulders.

Suddenly my thoughts were interrupted by the sound of running feet behind me and by a voice which called me by name. I turned, expecting to see Dr. Mortimer, but to my surprise it was a stranger who was pursuing me. He was a small, slim, clean-shaven, prim-faced man, flaxen-haired and lean-jawed, between thirty and forty years of age, dressed in a grey suit and wearing a straw hat. A tin box for botanical specimens hung over his shoulder, and he carried a green butterfly-net in one of his hands.

“You will, I am sure, excuse my presumption, Dr. Watson,” said he as he came panting up to where I stood. “Here on the moor we are homely folk, and do not wait for formal introductions. You may