A little group of horsemen waited for the last farewells at the cantonment boundary, and one of them riding alongside told Philip Marsden that a clue had been found, and the truth would be made manifest. The conventional answer of pleasure came reluctantly, but as the hands of the two men met, the gloomy, troubled face looked almost wistfully into the clever, contented one. "You are very good to her, Raby; I know that; good-bye." The workmanlike groans and shrieks of the fife and drum replaced the retiring bands, and as cheer after cheer greeted the final departure Philip Marsden felt that John Raby was left completely master of the situation. That evening, twenty miles out among the sandhills, he put his pride in his pocket, impelled thereto by a persistent gnawing at his heart, and followed the advice of writing to Belle; an honest, if somewhat hard letter, telling her, not of his good deeds, but the truth of those which seemed to her bad. Ten days after at Peshawar, with the last civilised post he was to see for many weeks, his letter came back to him unopened and re-addressed in a shaky hand. The heart-ache was better by that time. "She might have afforded me the courtesy of an envelope," he said as he threw the letter into the camp-fire. CHAPTER IX. The clue spoken of by John Raby lay in the note for a thousand rupees with which Colonel Stuart had paid a portion of his card debts during his last deal in the great game. It proved to be not only one of the missing notes, but, as luck would have it, the very one about the number of which uncertainty existed. The figures stood as the Colonel had written them; so the mistake lay with the usurer, if it was really a mistake. John Raby lit a cigarette and meditated, with the list before him; but beyond an odd persistency in threes and fives, the figures presented no peculiarity. So he set the problem aside till he could tackle it on the spot where it had arisen; for he was a great believer in scenery as an aid to the senses.