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Our new discovery seemed to me so remarkable that I lost no time in impressing upon Madame Gabrielle the imperative necessity of the closest possible scrutiny of Blind Heinrich's actions. I was more than anxious that we should not lose sight of him for an instant, and that I should be kept fully informed of his every action. For by this time I was firmly convinced that, through some medium which we had yet to discover, he was in some way keeping up communication with the more active agents of the enemy. And if we could but discover the channel through which the stream of communications flowed, it would not be long, I felt sure, before we had the key to the mystery in our hands.
Suddenly, and without any obvious reason, Heinrich completely changed his habits. Hitherto always on the move, he took to remaining indoors all day, hardly ever going out except for a short stroll in the evening. He met no one and apparently spoke scarcely a word to anybody. What his numerous pupils thought of his sudden neglect of them I cannot say. But it was clear enough that something important must have occurred to induce him thus suddenly to abandon what was, professedly at any rate, his sole means of livelihood.