Who is the Blade Man and why has this mysterious loner been attacking Mainland Public Transport bus drivers? And who is trying to burn MPT down? The company's president suspects an inside job and orders security officer Casey Holland to launch an internal investigation or face termination.

Convinced that she's being set up to fail, Casey feels the pressure. With her and Lou's wedding only weeks away, Casey desperately needs answers, but anger at work and on the streets thwart her efforts. Nor do the police welcome her help.

More employees are attacked, and the president forces Casey to take deeper risks. But how much is too much? How far must she go before facing off with him and MPT's enemies? Find out in this explosive sixth installment of Casey Holland transit mysteries.