-Castle has less than a day to live unless the antidote can be found. Beckett and McCord learn that reporter Brad Parker was after a story on Dreamworld but that Defense Secretary Reed shut it down.
-Reed admits (off the record) that the Dreamworld base exists and that Jack Bronson was a part of a special operation that bombed Al Queda's second in command. What Reed doesn't tell them was that he gave the order to bomb the building knowing that an undercover federal agent was inside.
-That agent was Parker's fiance. He stole the toxin to kill Reed's wife. Beckett and McCord stop him and retrieve the antidote as Castle lies unconscious outside.
-When Castle wakes up in the hospital, Beckett says she's sorry this has been so hard. Castle tells her that sometimes the hardest things are the ones worth doing and that they will find their way.
-When Beckett asks McCord whether the Secretary of Defense will be investigated, McCord say no and that Beckett will have to get used to working in a town where things are frequently not black and white.