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 someone 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.”