"This house?"
"Yes."
"But what did he come here for?"
"To hide the proceeds of his theft, the sixty bank-notes."
"How do you mean? Where?"
"In a flat of which he had the key, on the fifth floor."
Gaston Dutreuil exclaimed, in amazement:
"But there's only one flat on the fifth floor and that's the one I live in!"
"Exactly; and, as you were at the cinema with Madame Aubrieux and her mother, advantage was taken of your absence...."
"Impossible! No one has the key except myself."