After all, however, he became soon aware that it was only a step. To himself it might be conclusive proof, but that was not sufficient, and he felt irritated and baffled. In what shape did the danger threaten, and would it be yet impossible for him to turn its tide? He had thought of giving Anthony Miles the letter, and so openly accusing him as to force from him a confession of his shamelessness; but, with a passionate impotence, he acknowledged this to be a vain manner of confronting the blow. He was not in the position to make good his claim. He must meet his enemy with all the subtlety of self-defence. But what had he to meet? How should he know what lay before him, from which side the thrusts should be parried, in what shape grew the threat? The questions beat in his brain with recurrent strokes, as if a hammer were smiting dull iron. All the keenness of suspicion could do no more than bring a shadowy uncertainty before him; nothing could solve the problem except the letter, with its poor feeble failing writing, which he held in his hand. For there, to be sure, lay the certainty; there was hid the proof or the acquittal, as the case might be. He began to look at it as though Anthony were the prisoner on trial before him, while he himself was the person who possessed the clew, and could determine the guilt. To his distorted reasoning it became almost a sin against Anthony not at once to decide the question, when, after all, he might be innocent, and surely it would be better that this innocence should be placed beyond the power of doubt, than that so cruel a suspicion should divide two friends. For Anthony's own sake it seemed to Marmaduke a duty to determine the truth forever. The letter had been given to him for some purpose, he argued, as a man will argue, himself clothing the temptation in the strong armour with which it comes to meet him at last, mighty and irresistible. It needed only one look to convince himself, a look which could not harm Anthony Miles in any way, only put Marmaduke on his guard, and show him how to defend his rights. One look--nothing more-- at the letter which was in his hands.