Flowers for Your Grave - S1-E1
Gina: What kind of idiot kills off his best-selling main character?
Castle: Are you asking as my blood-sucking publisher or as my blood-sucking ex-wife?
Gina: Oh, is that what you're doing? Punishing me by killing the golden goose?
Castle: Oh, come on. I may be petty and short-sighted, but I'm not that petty and short-sighted.
Answer: The networks are now having winter breaks. A mid season end of new episodes, when they come back after the new year, it picks up as if several months have gone by. Beckett suggested Valentine's Day as a "chick flick" to watch as she is moved in. Also some episodes are not scheduled to air in order.