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Castle's book agent has gotten him an offer that would be a dream job and could greatly enhance his career. Signing the offer, however, would mean the end of his relationship with Beckett, as he would have to turn away from Nikki Heat, and both Castle and Beckett are realizing a reluctance to do that, even as they work a case that may be their last... a lonely woman whose body was found tossed down a manhole.
Beckett: The Irony is it never would have connected them. We don't go through a victim's mail unless there's probable cause and a warrant first.
Castle: Thank you.
Beckett: For what?
Castle: For using 'irony' correctly. Ever since that Alanis Morisette song, people uses it when they actually mean 'coincidence', drives me nuts!
Beckett: Yeah, well, it must be your great grammatical influence over me.
Title: When the Bough Breaks
The title comes from a classic bit of folk poetry, first known recording appearing in 1765, which has become part of a song titled "Rock-a-bye Baby". The current most popular form of the lyrics is
Rock-a-bye baby, in the treetop,
When the wind blows, the cradle will rock,
When the bough breaks, the cradle will fall,
And down will come baby, cradle and all.
The song is said to be the first poem written on American soil. It may have its origins in political matters, as well, possibly referring to the son of England's King James II, who may have had a baby snuck into the birthing room to become heir to the throne (the child was never king, the Glorious Revolution replaced the Catholic James with the Protestant William and Mary).