What does Shonda Rhimes have up her creative sleeve for the Grey's Anatomy Season 9 finale?

It's a question many fans have likely been asking themselves for weeks, but the curiosity level may now be at an all-time high after the following casting news hit the Internet:

The ABC drama is seeking a big name to come on board later this spring in the role of a detective.

For what possible reason? Your guess is as sound as ours.

But loyal Grey's Anatomy fans are aware that Rhimes goes all out for her season finales (see crash, plane), so we can only imagine how a detective will come into play as Season 9 winds now.

Let the theories fly now!

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.