“Someone is hoaxing us,” cried Dr. Tosswill, rising indignantly to his feet.

“It went into your tent, Harper,” muttered Sir Guy, his face dreadfully pale.

“No,” said Poirot, shaking his head, “into that of the Dr. Ames.”

The doctor stared at him incredulously; then, repeating Dr. Tosswill’s words, he cried:

“Someone is hoaxing us. Come, we’ll soon catch the fellow.”