“Mademoiselle is a niece of the Countess Polda,” said M. Popeau quietly. “She is staying at La Solitude for the winter.”

M. Bouton looked at Lily with enhanced respect.

“Now take La Solitude as the point of departure, and try to concentrate your mind on where you found the body,” said M. Popeau, handing Lily back the cane.

She moved the point slowly, hesitatingly, down the map.

“Surely you are going too far!” cried M. Popeau.

“Perhaps I am——”

She knitted her brow in some distress. “Do you remember the place where our taxicab stopped?” she asked.

“Of course I do—it’s marked here.”

He took the wand from her hand. “Here it is—this little white spot.”

“It was just below there,” said Lily.