This is a new(ish) series on ABC. It stars Nathan Fillion (Captain Mal from Firefly), as Richard Castle, a mystery writer who is called in for questioning when someone copies a murder out of one of his books. He gets involved in the investigation, and though his connections in New York, he's able to follow around Detective Beckett, a hot and smart detective who solves murders.
Castle bases his next main character after her, and they go from there.
It's in the middle of the second season now, and it's really fun to watch. I highly reccomend it, and if anyone else has seen it, I would love to discuss it.
-kv