Sudden Death — John Carson

A man stabs his boss before throwing him off the roof of the office building. As Detective Inspector Frank Miller has him cornered on the roof of the building, the killer jumps to his death. A woman sets fire to the hotel kitchen where she works, then stabs and kills two co-workers before leaping to her death from the North Bridge. Miller wonders what would make two, seemingly innocent people commit such atrocious acts. The investigation leads them to a wellness centre. An undercover operation is mounted by Miller and his boss. Then another atrocity occurs, but by then, it's too late. Somebody is literally making life and death decisions, but he isn't finished yet. He's only just started...