Castle, Season 4

Beckett:
He won't leave?

Ryan:
Charlie's pretty convinced about this whole zombie thing.

Beckett:
Yeah, but that's just… That's ridiculous.

Castle:
Or is it? Charlie has not been wrong yet. Maybe our killer is Patient Zero, out there right now in the streets of New York, building an army of the undead.

Beckett:
Castle, what we are looking for is not a zombie, but a very smart criminal who murdered David Lock and is now making our only witness look crazy. And he also dressed up in makeup and a costume to hide his identity.

Castle:
Unless that's not costume or makeup.

Ryan:
I mean, he does look like a real zombie.

Esposito:
A real zombie? I'm embarrassed for you, bro.

Beckett:
Okay, then explain this. Why would a zombie go after a currency trader at 4:00 am in a garage?

Castle:
This one's easy. The more intelligent the victim, the more delicious the brains.