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.
|Anne Marie Howard||Guest Star|
|Brian Klugman||Guest Star|
|Joe O'Connor||Guest Star|
|Lee Tergesen||Guest Star|
|Michael Mosley||Guest Star|
|Ping Wu||Guest Star|
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