Stana Katic and Nathan Fillion, Castle Stana Katic and Nathan Fillion, Castle

Will Castle's season finale finally give fans the Caskett (Castle and Beckett) hookup they've been craving after four seasons of foreplay? Exec producer Andrew Marlowe ain't sayin', but he will reveal that the specter of gunned-down Captain Montgomery will be felt as the conspiracy surrounding the murder of Beckett's mom is revived.

"It will be an emotionally explosive episode that will leave both of our characters changed," Andrew promises, adding that with Castle's daughter, Alexis, leaving the nest, he will be forced to make some big decisions about his future. 

And should the case of Beckett's mom be resolved, wouldn't it make sense for her emotional wall to come down and both characters' clothes to come off? All Andrew will say is, "Everything is going to be laid on the table and our characters are going to have to act upon what they find out — both in terms of the case and emotions." When the time comes for him to send Castle and Beckett to the bedroom, Andrew adds, "I want it to be important and special for them."

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