The Madman's Blade — J.D. Hardin

The victim's father has already been to the Pinkerton Agency twice. Now he's back a third time to hire himself a detective. One look at the poor man's face and Raider is hooked. He'll track down the dapper-dressing dude who raped and killed the young girl. But finding eh cold-blooded killer with unlimited cash and brilliantly twisted mind ain't easy. All raider has to go on is the killer's gruesome handiwork with a blade, and a trail of murder that leads to a bloody showdown.