Re: Castle Season 5 (including Spoilers)
I think I've figured out how they will eventually end the series. They will wrap up the Kate's Mom storyline by having Castle's Dad shoot the Senator, and for some reason it will be a sanctioned hit.
And they all lived happily ever after.
"They have to help the viewers let go. Firefly did a movie to wrap things up. Buffy the Vampire Slayer continued on as a comic book. Heroes gradually lowered the quality season by season until we were grateful it ended.” - Sheldon Cooper