Truly, it was a well-thought-out scheme! And how nearly had it succeeded! But its success would be short-lived. With set teeth and frowning brow French vowed to himself that he would not rest until he had the monster who had done this deed safely under lock and key. CHAPTER THIRTEEN The Piece of Yellow Clay All that day Inspector French’s thoughts kept reverting to that tense moment in the cemetery when the lid of the coffin had been raised and his theory had been so dramatically established. The memory filled his mind with a deep satisfaction. He felt that he had achieved nothing less than a veritable triumph. Other cases he had handled well, indeed he thought he might say brilliantly. But in no previous case had he solved his problem by such a creative effort of the imagination. He had imagined what might have happened, he had tested his theory, and he had found it had happened. The highest kind of work, this! His superiors could not fail to be impressed. But there was more than that in it. Seldom had he known of a case which contained such arresting and dramatic features. When the facts became known they would make something more than a nine days’ wonder. The old miser, living meanly in his decaying house at the bottom of that sinister hollow on the lonely moor; the hoarded thousands in his safe; the terrible conflagration which wiped out in a night the whole building and everything it contained; the discovery that the tragedy was no accident, but that murder lurked behind it; the other murder, when Markham Giles was done to death for a purpose too dreadful and gruesome to contemplate without a thrill of horror; these things would make the Starvel Hollow crime re-echo round the world. It would be the crime of the century. No one could fail to be moved by it. And all would react to his, French’s advantage. For a moment he allowed himself to dream. Chief Inspector Armstrong was getting old. He must soon retire . . . French ran over in his mind his possible successors. Yes, it was conceivable . . . With this brilliant case to his credit it was almost likely . . . A ravishing prospect! But French was at heart too sound a man to waste time in day-dreaming while there was work to be done. He had pulled off a _coup_ and had every reason to be pleased with himself, but he had not completed his case. He had solved his problem, but he had not found his criminal. Until Roper was under lock and key he could not relax his efforts or look for his reward.