Four seemingly unsolvable murders have happened in San Francisco, and San Francisco Police Department Homicide Inspectors Keller and Park have caught the once in a lifetime case. It's one of those cases that will live forever in their minds, and their nightmares. The San Francisco 'Face-taker' kills the victims with a knife, mutilating the bodies of the slain, much the same way as Jack the Ripper did over a hundred years ago in London England. The difference between Jack the Ripper and the Face-taker is that Keller and Park intend to solve this one. One way or another. The two San Francisco Police Inspectors have to search through the prostitution underworld to try and find the serial killer who is dissecting the victims of these brutal murders. While dealing with the sleepless nights Inspector Keller and Inspector Park have to deal with their new partnership, as well as Keller's guilt over his failed marriage.