Gunshots, a fleeing van and a massive blood pool all point to murder, but when Castle & Beckett arrive at the crime scene, they discover that it lacks something - the victim! The investigation leads to the cutting-edge world of life-extension science, a cunning high-tech researcher, and a sleazy porn mogul who invested in a modern-day "fountain of youth."

Meanwhile, Alexis finds out whether she got into Stanford.

original airdate-October 3,2001      rating-11.7 million #1

songs--Theme Song: "Keep Hope Alive" by The Crystal Method

1. "The One"by Black Mustang
2. "Theme song:Castle Whistle Theme by Robert Duncan"

Trivia--Cynthia's suicide at the end would not have been possible if she were being held at an NYPD police station. It is standard procedure to confiscate and store all a detainee's personal effects, including all rings (even wedding bands), jewelry, belts, and every object in their pockets. Her ring would have been removed during the booking process and would likely have been examined for a hidden capsule.