In my mind's eye I saw Mademoiselle Stangerson re-enter the pavilion, go to her room to take off her hat, and find herself faced by the murderer.

He had been in the pavilion for some time waiting for her.

He had arranged to pass the whole night there.

He had taken off Daddy Jacques's boots; he had removed the papers from the cabinet; and had then slipped under the bed.

Finding the time long, he had risen, gone again into the laboratory, then into the vestibule, looked into the garden, and had seen, coming towards the pavilion, Mademoiselle Stangerson--alone.