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'Castle' is a guy living in a fantasy world. He's in his imagination, writing these stories of murder.

You know, Castle's the kind of guy that when he meets somebody, that's a connection for him. He remains connected to the people that he meets. That's the kind of guy he is, be they criminals, gangster rappers, mafia guys, art thieves, whoever it is, he nurtures those relationships.

It's true that Blake was emotionally disturbed - always has been - but he doesn't have murder in his heart. If he was going to do any damage to anything or anyone, it would be to himself.

The why of murder always fascinates me so much more than the how.

A man's house is his castle.

One of the hardest things to believe is that anyone will abandon the effort to escape a charge of murder. It is extremely important to suspend disbelief on that. If you don't, the story is spoiled.

If Inigo Montoya were around now, he wouldn't need to storm the castle to bring his father's murderer to justice; the police would do it for him, and fewer people would have to die.

There was a castle called Doubting Castle, the owner whereof was Giant Despair.

I'm constantly pitching one episode where we see life through Castle's eyes. I think Castle's just a little off as far as his perception goes. A very, very clever man, but I want to see the world as Castle sees it - kind of a rose-colored glasses, all the women find him irresistible, all the guys find him super cool and do whatever he says.

In the same way he's fascinated by crosswords, the puzzle of solving the murder is what drives him on.