“The absence of the latter means nothing, though its presence may mean everything,” said Holmes. “Unless the powder from a badly fitting cartridge happens to spurt backward, one may fire many shots without leaving a sign. I would suggest that Mr. Cubitt’s body may now be removed. I suppose, Doctor, you have not recovered the bullet which wounded the lady?”

“A serious operation will be necessary before that can be done. But there are still four cartridges in the revolver. Two have been fired and two wounds inflicted, so that each bullet can be accounted for.”

“So it would seem,” said Holmes. “Perhaps you can account also for the bullet which has so obviously struck the edge of the window?”

He had turned suddenly, and his long, thin finger was pointing to a hole which had been drilled right through the lower window-sash, about an inch above the bottom.