His thoughts wandered to Sir Ralph Fairfield. Here was a man whose services would be invaluable if he could be persuaded to help. Grell knew him; trusted him. Foyle was a man who never neglected the remotest chances. He deemed it worth trying. True, so far as their encounters were concerned, Fairfield had not been encouraging. He would probably need delicate handling. Foyle wrote a note, scrutinised it rapidly, and, going out, gave it to a clerk to be sent at once by special messenger. "Mr. Heldon Foyle presents his compliments to Sir Ralph Fairfield and would be obliged if he could see him at his office at six o'clock this evening, or failing that, by an early appointment, on a matter of urgent importance." That was all it said: Foyle never wasted a word. At five minutes past six that evening, Sir Ralph Fairfield was announced. He ignored the offer of a chair which was made by the superintendent, and stood with stony face a few paces from the door. Foyle was too wise to offer his hand. He knew it would not be accepted. He nodded affably. "Good evening, Sir Ralph. I was hoping you would come. I would not have troubled you but that I felt you would like to know how we are getting on. You were a friend of Mr. Grell's." "Well?" said Sir Ralph frigidly. "I am here, Mr. Foyle. Will you let me know what you want to say and have done with it?" His manner was entirely antagonistic. There was still a lingering fear of arrest in his mind, but his attitude was in the main caused by the fact that he believed he had been suspected by the other. The superintendent partly guessed what was passing in his mind. "I want your word first, Sir Ralph, that what I tell you shall not be spoken of by you to any living soul," he said. "Then I will tell you frankly and openly the whole history of our investigation, and you can decide whether you will help us or not. No--wait a moment. I know how loyal a friend you were of Robert Grell's, and it's in the light of that, that I am going to trust you. He is not dead. He is in hiding. It is for you to say whether you will help us to find him. If he is innocent he has nothing to fear." He was watching the other closely while he sprung the fact that Grell was alive upon him. He wanted to know whether it was really a surprise, whether in spite of the vigilance of the C.I.D. men Grell or his companions had managed to communicate with Fairfield. The baronet had opened his mouth to speak. A flicker of colour came and went in his pale cheeks, and he fingered his stick nervously. Then his jaw set, and he strode to where the superintendent was sitting and clutched him tightly by the arm. "What's all this?" he demanded hoarsely. "Do you mean to say Grell is not dead?" "As far as I know he is as alive as you or I at this present minute," said Foyle. "If you want to hear about it all, give me your word and sit down. You're hurting my arm."