"But the communicating door is bolted and the window locked."
"Let us inspect it," repeated M. Lenormand.
He was taken into the apartment, which was the first of the five rooms reserved for Mrs. Kesselbach. Then, at his request, he was taken to the rooms leading out of it. All the communicating doors were bolted on both sides.
"Are not any of these rooms occupied?" he asked.
"No."
"Where are the keys?"
"The keys are always kept in the office."
"Then no one can have got in? . . ."
"No one, except the floor-waiter who airs and dusts the rooms."
"Send for him, please."