`It's not turning!...And Christine, sir, Christine?'

The Persian said coldly:

`We shall do all that it is humanly possible to do!...But he may stop us at the first step!...He commands the walls, the doors and the trapdoors. In my country, he was known by a name which means the `trap- door lover.''

`But why do these walls obey him alone? He did not build them!'

`Yes, sir, that is just what he did!'

Raoul looked at him in amazement; but the Persian made a sign to him to be silent and pointed to the glass....There was a sort of shivering reflection. Their image was troubled as in a rippling sheet of water and then all became stationary again.

`You see, sir, that it is not turning! Let us take another road!'

`To-night, there is no other!' declared the Persian, in a singularly mournful voice. `And now, look out! And be ready to fire.'

He himself raised his pistol opposite the glass. Raoul imitated his movement. With his free arm, the Persian drew the young man to his chest and, suddenly, the mirror turned, in a blinding daze of cross- lights: it turned like one of those revolving doors which have lately been fixed to the entrances of most restaurants, it turned, carrying Raoul and the Persian with it and suddenly hurling them from the full light into the deepest darkness.