City of Whispering Death — Grant Stockbridge

No criminal dared testify against another, while the Whisper was crime-emperor of New York-and the forces of the law were powerless against the ravages of the Underworld! For when the Whisper's eerie warning fell over Manhattan men died, slashed to bloody bits by a weapon that was invisible but killed horribly! In that awe-struck city of riotous crime, where a murmuring voice brought instantaneous death, Richard Wentworth, in the Spider's strange garb, took up a doomed people's cause-fighting a Whispering Fury that loosed its thunderbolts in a tornado's teeth and slew foully to pile up a fortune in streamlined corpses!