"Do you think the police are the fools you are?
Everything points to the fact that you were out of doors and near the pavilion at the time of the tragedy.

What were you doing there?
So far as I am concerned," he said, turning to Monsieur Stangerson, "I can only explain the escape of the murderer on the assumption of help from these two accomplices.

As soon as the door was forced open, and while you, Monsieur Stangerson, were occupied with your unfortunate child, the concierge and his wife facilitated the flight of the murderer, who, screening himself behind them, reached the window in the vestibule, and sprang out of it into the park.

The concierge closed the window after him and fastened the blinds, which certainly could not have closed and fastened of themselves.

That is the conclusion I have arrived at.