Mister X He mutilates his victims. Slices their throats. And carves an X into their flesh. Five years ago, he claimed the lives of six women. Then the killings abruptly stopped-no one knows why. Ex-homicide detective Frank Quinn remembers. Which is why he's shocked to see one of the dead women in his office. Actually, she's the identical twin of the last victim, and she wants Quinn to find her sister's murderer. But when the cold case heats up, it...

When a killer who blurs the line between male and female, human and monster returns with a vengeance after a 10-year hiatus, homicide detective turned P.I. Frank Morgan must stop the killing once and for all.

Six dead women in a hotel room. Five of them students, still in their teens. Tied up. Tortured. The NYPD recognizes the suspect's signature--three bloody initials carved into each victim's forehead. Ex-cop Frank Quinn has faced this madman before. Both bear scars from their last encounter. In a deadly game of matched wits, only one can prevail. It's not just about who gets killed. It's about who will survive.