Have you been following the Castle mystery on Twitter?

It all started with an innocent trip to The Hamptons. Fictional fiction writer, Richard Castle, was worried that his daughter hadn't returned from her walk with a new boy. He set off on the beach to look for her, and instead found... a foot.

Castle, ABC's quirky police procedural starring Nathan Fillion, is working overtime to snag viewers. In addition to the release of Heat Wave, an actual novel written by and based upon the fictional characters in the show, "Richard Castle" has also started a Twitter account. While his updates started off innocently enough, with tales of drinks with his neighbor Jerry Seinfeld, things quickly took a darker turn when a severed foot turned up on the beach.

Now, Twitter followers of @WriteRCastle can go along with the writer as he searches for clues, first to the victim's identity, and then, hopefully to the killer. He's been on the case for a little more than a week, and has already turned up some interesting information-- with accompanying pictures.

While Nathan Fillion doesn't run the WriteRCastle account, it is officially sanctioned by ABC. So whether it's an actual Castle writer, or just a lowly intern who's maintaining it, they do a great job of capturing the character's dry humor and propensity for awkward puns.

There's no word on how long the mystery will last, but at about 9 days in, Castle has just identified the victim. You can easily catch up on the Twitter page if you haven't been following already, which I highly recommend. Whether you're a fan of the show, or just severed feet (and really, everybody falls into at least one of those categories, right?), then it's a fun summer diversion until the series returns in the fall.