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"Well," continued the dark-eyed man, "the rude awakening came in the following way. The thirteenth of January was on Sunday. Kirk, who had been engaged in watching the movements of the secret agent Leftwich, sent me a telegram telling me to leave for Edinburgh at 11: 30 that evening, and asking me, if I intended to carry out this suggestion, to raise and lower the drawing-room blind three times at a quarter past five. By that I knew that the German agent and his friends had some desperate game afoot and that Kirk, astute and active, intended to prevent them carrying out their object."
"If anyone obtained access to the laboratory, then, they could steal the secret? " I asked.