Castle dove straight into the world of nerds and comic books this week, much to the delight of at least one critic.
Next Monday, meanwhile, the ABC hit takes us inside a wholly different world: that of life-extension science.
Watch the following preview for "Head Case" and see what happens when Castle and Beckett encounter a crime scene... with no body. Elsewhere, Alexis hears from Stanford University. Check out the trailer now:
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