A perplexed frown was beginning to gather between Poirot’s eyes.

“What is it?” I whispered.

He shook his head impatiently, and asked a question:

“Pardon, M. Bex, but without doubt M. Renauld could drive the car himself?”

The commissary looked over at Françoise, and the old woman replied promptly:

“No, Monsieur did not drive himself.”

Poirot’s frown deepened.

“I wish you would tell me what is worrying you,” I said impatiently.

“See you not? In his letter M. Renauld speaks of sending the car for me to Calais.”

“Perhaps he meant a hired car,” I suggested.