Why exactly arent they doing an episode tonight?

To put us all through agony

It's because it is being pre-empted سے طرف کی Bones. I know it sounds bad, but believe me, Bones has been pre-empted countless times this season, and لومڑی is finally giving شائقین their episodes. The other solution was to اقدام the Bones season finale to the season premiere of اگلے season. As a Bones and House fan, I'm happy. :p