Mon Dieu,” said Poirot, in a very low voice, “I do not understand this. It is horrible. Tell me, monsieur, there is no doubt that it was tetanus?”

“I believe not. But Dr. Ames will tell you more than I can do.”

“Ah, of course, you are not the doctor.”

“My name is Tosswill.”

This, then, was the British expert described by Lady Willard as being a minor official at the British Museum. There was something at once grave and steadfast about him that took my fancy.

“If you will come with me,” continued Dr. Tosswill, “I will take you to Sir Guy Willard. He was most anxious to be informed as soon as you should arrive.”

We were taken across the camp to a large tent. Dr. Tosswill lifted up the flap and we entered. Three men were sitting inside.

“Monsieur Poirot and Captain Hastings have arrived, Sir Guy,” said Tosswill.

The youngest of the three men jumped up and came forward to greet us. There was a certain impulsiveness in his manner which reminded me of his mother. He was not nearly so sunburnt as the others, and that fact, coupled with a certain haggardness round the eyes, made him look older than his twenty-two years. He was clearly endeavouring to bear up under a severe mental strain.

He introduced his two companions, Dr. Ames, a capable looking man of thirty odd, with a touch of greying hair at the temples, and Mr. Harper, the secretary, a pleasant lean young man wearing the national insignia of horn-rimmed spectacles.