And he dropped into the arms of the Persian, who told him to lie down flat, closed the trap-door above him and crouched down beside him. Raoul tried to ask a question, but the Persian's hand was on his mouth and he heard a voice which he recognized as that of the commissary of police.

Raoul and the Persian were completely hidden behind a wooden partition. Near them, a small staircase led to a little room in which the commissary appeared to be walking up and down, asking questions. The faint light was just enough to enable Raoul to distinguish the shape of things around him. And he could not restrain a dull cry: there were three corpses there.

The first lay on the narrow landing of the little staircase; the two others had rolled to the bottom of the staircase. Raoul could have touched one of the two poor wretches by passing his fingers through the partition.

"Silence!" whispered the Persian.

He too had seen the bodies and he gave one word in explanation:

"HE!"

The commissary's voice was now heard more distinctly. He was asking for information about the system of lighting, which the stage-manager supplied. The commissary therefore must be in the "organ" or its immediate neighborhood.

Contrary to what one might think, especially in connection with an opera-house, the "organ" is not a musical instrument. At that time, electricity was employed only for a very few scenic effects and for the bells. The immense building and the stage itself were still lit by gas; hydrogen was used to regulate and modify the lighting of a scene; and this was done by means of a special apparatus which, because of the multiplicity of its pipes, was known as the "organ." A box beside the prompter's box was reserved for the chief gas-man, who from there gave his orders to his assistants and saw that they were executed. Mauclair stayed in this box during all the performances.

But now Mauclair was not in his box and his assistants not in their places.

"Mauclair! Mauclair!"