Presently it came again.

"Help, for Heaven's sake, help!"

Off I dashed to the rescue.

Crack!

Then came a wild wail.

Crack!

Then I heard a thud, as of a human being falling heavily to the sidewalk. And as the person uttered no further cries, one of two things must be the case—he was either insensible or dead.

I increased my pace, and presently turning a corner, saw a burly fellow just dragging a body beneath a gas-lamp, the better to enable him to secure the plunder on his victim's body.

The assassin had already secured most of the stricken man's valuables, when my rapid approach alarmed him, and jumping up, he sprang along the street at a break-neck pace.

Crack!