have had many reasons for assisting him. She most likely had a shrewd idea of the situation and resolved to profit by it to avert suspicion. While Grell was suspected she would be safe. But it may have occurred to her that if we laid our hands on him and he told us anything, we might get on her track. Suppose that to be so, it is not difficult to see why she should take a prominent part in assisting him. She would still have a certain amount of money, for he paid her to come to England, and she, as we know, would stand at nothing."
"It all sounds very interesting," commented the Assistant Commissioner, "but it looks to me as though it may be a tough proposition to get evidence bearing it out."
Foyle pulled out his watch. "My idea may all tumble to pieces as soon as a test is applied. I can't pretend to be infallible. But we can try. I am going back to Scotland Yard now, sir. It is ten o'clock. I expect to be at it all night. Are you coming back?"
"No, I don't think I can be of any assistance to you. I shall be glad if your theory does come out all right this time. The alternative suspicions are horrible. Good night, Mr. Foyle."
CHAPTER LIII
With his mind revolving the strength and weakness of his theory, Heldon Foyle returned to Scotland Yard. He paused for a moment at the door of the night-inspector's room.
"Anything for me, Slack?" he asked. "Has Mr. Bolt come in? Ah, there you are, Bolt. Come down to my room." He led the way down the green corridor, the divisional inspector following.
"Well?" asked the superintendent sharply, as he seated himself in his office.