When I returned to the pavilion, this window had been closed and Monsieur and Mademoiselle were already at work in the laboratory." "Monsieur or Mademoiselle Stangerson had, no doubt, shut it ?" "No doubt." "You did not ask them ?" After a close scrutiny of the little lavatory and of the staircase leading up to the attic, Rouletabille--to whom we seemed no longer to exist--entered the laboratory.

I followed him.

It was, I confess, in a state of great excitement.

Robert Darzac lost none of my friend's movements.

As for me, my eyes were drawn at once to the door of The Yellow Room.