When a beautiful woman is found dead in an alley, all clues point to her being a victim of the notorious Triple Killer. The Triple Killer, or 3XK, terrorized New York City four years ago, then mysteriously disappeared. Now he's back. In a deadly battle of wits, Castle and Beckett race against time to stop 3XK before he claims his next victims.

Episode info coming soon ..

In an effort to woo Margaret, Mordecai starts using a cologne that can supposedly attract women, called "Dude Time". Unfortunately, all it seems to attract are unicorns.

Stephen celebrates his fifth anniversary, and Nicholas Negroponte gives laptops to poor children.

Episode info coming soon ..