Someone's killing the richest men and women in the world, and they're doing it in the most inexplicable way. New York City Detective Masson was a lone wolf. It had been 15 years since the murder of his last, and only partner. Faced with the most diabolical case he'd ever encountered involving a strange poison that caused the corpses to age abnormally fast, he took a risk and joined forces with a female rookie. And then, the unthinkable happens, his worst fear is realized, and she too is murdered. More determined than ever to solve the case or die trying, Detective Masson comes face-to-face with the madness when a mysterious woman is spotted in each of the cities where the murders occurred. He tracks her down in Colorado but finds no solid evidence that she committed the murders herself, and her evasive answers to his questions only baffle him. At what cost, what higher price must Detective Masson pay in order to solve the case?