"Do you mean you are going to walk, sir?"

"No, my young friend. I am no St Peter. I prefer to cross the sea by boat."

"To cross the sea?"

"Yes. To work with method, one must begin from the beginning. And the beginning of this affair was in England. Therefore, we return to England."

At three o'clock, we stood once more upon Charing Cross platform. To all our expostulations, Poirot turned a deaf ear, and reiterated again and again that to start at the beginning was not a waste of time, but the only way. On the way over, he had conferred with Norman in a low voice, and the latter had dispatched a sheaf of telegrams from Dover.

Owing to the special passes held by Norman, we got through everywhere in record time. In London, a large police car was waiting for us, with some plain-clothes men, one of whom handed a typewritten sheet of paper to my friend. He answered my inquiring glance.

"A list of the cottage hospitals within a certain radius west of London. I wired for it from Dover." We were whirled rapidly through the London streets. We were on the Bath Road. On we went, through Hammersmith, Chiswick and Brentford. I began to see our objective. Through Windsor and on to Ascot. My heart gave a leap. Ascot was where Daniels had an aunt living. We were after him, then, not O'Murphy.

We duly stopped at the gate of a trim villa. Poirot jumped out and rang the bell. I saw a perplexed frown dimming the radiance of his face. Plainly, he was not satisfied. The bell was answered. He was ushered inside. In a few moments he reappeared, and climbed into the car with a short, sharp shake of his head. My hopes began to die down. It was past four now. Even if he found certain evidence incriminating Daniels, what would be the good of it, unless he could wring from some one the exact spot in France where they were holding the Prime Minister?

Our return progress towards London was an interrupted one. We deviated from the main road more than once, and occasionally stopped at a small building, which I had no difficulty in recognizing as a cottage hospital. Poirot only spent a few minutes at each, but at every halt his radiant assurance was more and more restored.

He whispered something to Norman, to which the latter replied:

"Yes, if you turn off to the left, you will find them waiting by the bridge." We turned up a side road, and in the failing light I discerned a second car, waiting by the side of the road. It contained two men in plain clothes. Poirot got down and spoke to them, and then we started off in a northerly direction, the other car following close behind. We drove for some time, our objective being obviously one of the northern suburbs of London. Finally, we drove up to the front door of a tall house, standing a little back from the road in its own grounds.