Castle took fans behind the music and behind the murder on this week's "Swan Song."
Next Monday, meanwhile, the beloved ABC series will go... behind the movies? So Castle believes, at least, as the following preview references The Da Vinci Code.
In reality, however, Rick and Kate will find themselves on the run with a witness, hiding out and attempting to keep him safe. While also fighting about their relationship. Uh-oh!
Watch the official network teaser now: