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"Well, obviously it could not have been meant for the son. The

son, as far as he knew, was in Bristol. It was mere chance that

he was within earshot. The 'Cooee!' was meant to attract the

attention of whoever it was that he had the appointment with. But

'Cooee' is a distinctly Australian cry, and one which is used

between Australians. There is a strong presumption that the

person whom McCarthy expected to meet him at Boscombe Pool was

someone who had been in Australia."

"What of the rat, then?"

Sherlock Holmes took a folded paper from his pocket and flattened

it out on the table. "This is a map of the Colony of Victoria,"

he said. "I wired to Bristol for it last night." He put his hand

over part of the map. "What do you read?"

"ARAT," I read.

"And now?" He raised his hand.

"BALLARAT."

"Quite so. That was the word the man uttered, and of which his

son only caught the last two syllables. He was trying to utter

the name of his murderer. So and so, of Ballarat."

"It is wonderful!" I exclaimed.