It may have begun with murder but Kate Beckett had a back story and Richard Castle was intrigued. As Castle said, "The point is, there's always a story. You just have to find it." From the moment he profiled Detective Kate Beckett while they read fan letters from his crazy fans, we were hooked. Beckett looked shocked and a little mortified by how close he got to her story. To his credit, Castle looked chagrined that his attempts at guessing her history seemed to cause her pain. For fans, it was the start of a complex and provocative relationship of which we could never get enough.

Rick Castle is very much a ladies man. It's easy to see why, isn't it?

Rick Castle has never solved a crime before. But his people skills ought to help him get to the bottom of things.

Castle is called in to help the NYPD because someone is copying killings from his novel. Here, detective Beckett takes a close look at a crime scene.

Kate Beckett is all business. Until she meets Rick Castle, that is.

It's impossible to deny the chemistry between Rick and Kate; though Kate tries her best to in Castle's series premiere.

Rick Castle is an author, but he's happy to also be a part-time detective. Here's a shot from the show's series premiere.

Rick Castle is very good at making friends. And, the NYPD hopes, at solving crimes.

Kate Beckett isn't thrilled to be teaming with Rick Castle. Most women would be, however.

Castle is called in to help the NYPD with a murder investigation on the series premiere of Castle. He might as well hit on some women while he lends a hand.