be written in a cypher which you understand as well as I do. You had better open it and read it, in case there may be urgent reasons for cabling a reply at once. As soon as this business is done with and out of the way, Cotter, the better I shall be pleased. It is a bit dangerous even for us. Of course, we can trust Slater, who does everything himself and always uses the cypher which I defy even Scotland Yard to unravel. Still, as I said before, the work is dangerous, and I will never take on a scheme like that again. You had better use one of the cars as far as the post-office to save time."

"I shall be glad to," Cotter muttered.  "I should never dare to walk down to the village in the dark after seeing this infernal piece of string. The mere sight of it makes me shiver."

"I shall be glad to," Cotter muttered.  "I should never dare to walk down to the village in the dark after seeing this infernal piece of string. The mere sight of it makes me shiver."

Cotter muttered himself out of the room and Flower was left to his own thoughts. He sat for half an hour or more till the door opened and Cotter staggered into the room. He held in a shaking hand an envelope marked with the blue lines which usually accompany registered letters. "Look at it," he mumbled.  "That came straight from Borneo, written by Slater himself, sealed with his own private seal, and every line of it in cypher. I should be prepared to swear that no one but Slater had touched it. And then when I come to open the envelope, what do I find inside? Why, this! This! This!"

Cotter muttered himself out of the room and Flower was left to his own thoughts. He sat for half an hour or more till the door opened and Cotter staggered into the room. He held in a shaking hand an envelope marked with the blue lines which usually accompany registered letters. "Look at it," he mumbled.  "That came straight from Borneo, written by Slater himself, sealed with his own private seal, and every line of it in cypher. I should be prepared to swear that no one but Slater had touched it. And then when I come to open the envelope, what do I find inside? Why, this! This! This!"

With quivering fingers Cotter drew the letter from the envelope and unfolded the doubled-up page. From the middle of it dropped a smooth silken object which fell upon the table. It was another mysterious five-knotted string.

With quivering fingers Cotter drew the letter from the envelope and unfolded the doubled-up page. From the 

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