And then, just at the very instant that he swung off from the window sill, he heard a hoarse, triumphant laugh above.
He looked up.
Out of the window from which ran the rope, a man was leaning. In his hand was something on which the light from the street lamps glinted.
It was a knife!
With that knife the wretch, whose face was covered by a mask, gave a slash at the rope, just as Merry swung off from the sill.
With a twang, the rope parted!
It was sixty feet to the street below.
Frank fell.
CHAPTER XII.—THE NAME ON THE REGISTER.
Not far, however, for he released the rope and shot out his arms. He had swung across so that he was opposite the open window when the rope was cut.