It's safe to say Castle did not ring in the new year with one of its lighter episodes.
Quite the opposite, in fact, as Castle Season 6 Episode 11 featured an arsonist-turned-murder, a majorly charred corpse and the seemingly real possibility that Espo would miss the birth of his child.
Because he'd be dead.
"Under Fire," in fact, featured both Esposito and Ryan fighting for their lives, engulfed by flames in the basement of warehouse. A secret, sub-basement, that is.
How did they get out? We'll never tell. Watch Castle online now for the reveal: